What accelerates aging of the body: the main risk factors

Aging faster in the medical sense doesn't necessarily mean wrinkles develop earlier. It primarily refers to the earlier accumulation of chronic diseases, decreased muscle strength and physical function, deterioration of vascular, metabolic, and brain function, and an increased risk of premature death. The most compelling links to this type of adverse aging include smoking, physical inactivity, obesity and metabolic disorders, unhealthy diets, excessive alcohol consumption, and air pollution. The World Health Organization lists tobacco, physical inactivity, harmful alcohol consumption, unhealthy diets, and air pollution as the main modifiable factors of chronic diseases, accounting for a significant portion of premature mortality. [1]

Chronic sleep deprivation, sleep disturbances, prolonged psychosocial stress, depression, and social isolation are also associated with less favorable aging, but the cause-and-effect picture is more complex. For example, new meta-analyses have found a link between stress, loneliness, and depression and the acceleration of certain epigenetic clocks, but it has not yet been proven that eliminating these factors necessarily "rejuvenates" the body by a measurable number of biological years. [2]

Modern geroscience doesn't view aging as a single process with a single cause. The updated Hallmarks of Aging model describes genomic instability, epigenetic changes, mitochondrial and autophagic dysfunction, cellular senescence, chronic inflammation, stem cell exhaustion, and other interconnected mechanisms. Behavior and environment can influence several of these mechanisms simultaneously, but measuring the "rate of aging of the entire organism" with a single analysis is currently impossible. [3]

What factors have the most compelling link to adverse aging?

It is convenient to divide factors not by the effectiveness of their names, but by how well their influence has been confirmed in people.

Factor	What has been proven most convincingly	How appropriate is it to talk about “accelerated aging”?
Smoking	Premature death, cancer, heart disease, lung disease and vascular disease	Very convincing as a factor in reducing healthy life
Low physical activity	Increased risk of mortality, cardiovascular disease, diabetes, and functional decline	Very convincing
Obesity and metabolic disorders	Diabetes, hypertension, cardiovascular disease, some types of cancer, disability	Convincing for healthspan; biological clock data is also accumulating
Unhealthy diet	Cardiovascular disease, diabetes, cancer, premature mortality	Convincing for age-related diseases
Excessive alcohol consumption	Cancer, liver disease, trauma, cardiovascular and other consequences	Convincing, especially when consumed in large quantities
Air pollution	Cardiovascular, respiratory, cerebrovascular and other diseases, mortality	Convincing for health; epigenetic aging is an additional marker
Chronic poor sleep	Metabolic, cardiovascular, and cognitive adverse outcomes	Probably important, but the causality of some relationships is complex
Chronic stress	Physiological dysregulation and association with epigenetic aging and disease	Probably important, but the effect is more difficult to isolate from other factors
Social isolation	Higher mortality and risk of frailty in observational studies	A strong association, but not a simple causal mechanism
Excessive ultraviolet radiation	Skin aging, DNA damage, skin cancer	Proven to accelerate skin aging, not equivalent to aging of the entire body

The key practical point is that it makes sense to evaluate an “aging accelerator” based on its actual health consequences, not just on changes in telomeres, the epigenetic clock, or a single laboratory marker.

Smoking is one of the strongest factors in premature aging of health.

If you're looking for a factor whose impact on life expectancy is difficult to overestimate, smoking ranks among the top. Tobacco smoke damages virtually every organ and increases the risk of cardiovascular disease, stroke, chronic lung disease, and many types of cancer. In its 2026 update, the WHO states that all forms of tobacco use are harmful and that tobacco is associated with more than seven million deaths worldwide each year. [4]

The long-term follow-up data are particularly revealing. In a large study in the New England Journal of Medicine, regular smokers lost an average of at least ten years of life expectancy compared to never-smokers. People who quit smoking between the ages of 35 and 44 gained about nine years compared to those who continued, while those who quit between the ages of 45 and 54 gained about six years. [5]

At the molecular level, the picture is consistent with the clinical one. A 2025 systematic review, including 102 studies and over 180,000 participants, found that exposure to cigarette smoke was one of the environmental factors most consistently associated with epigenetic age acceleration. But even without this molecular data, the harm of smoking has already been proven in much more significant outcomes—morbidity and mortality. [6]

Therefore, it makes sense for a person who smokes and simultaneously takes antioxidants, NAD⁺ supplements, or other anti-aging agents to prioritize: quitting smoking has an incomparably more compelling evidence base for preserving healthy years of life.

Lack of movement accelerates functional aging

Sedentary behavior isn't simply a lack of additional benefits from exercise. High levels of sedentary behavior are themselves associated with adverse health outcomes. The WHO reports that in adults, high levels of sedentary time are associated with higher overall, cardiovascular, and cancer mortality, as well as a higher incidence of cardiovascular disease, cancer, and type 2 diabetes. [7]

With age, the effects become especially noticeable in the muscular system. If a muscle isn't required to generate significant force for a long time, its strength and functional reserve decline. A person may not have a serious illness, but gradually find it harder to climb stairs, get up from a chair, or recover from a period of bed rest. This functional decline is one of the most practically significant aspects of aging.

Therefore, walking and strength training serve different purposes. Regular movement reduces sedentary time and maintains cardiovascular endurance, while resistance training helps maintain muscle strength and mass. The WHO considers both components essential for physical activity in adults. [8]

No special "anti-aging" sport is required. The simple habit of regularly engaging your cardiovascular and muscular systems, rather than remaining virtually inactive for most of the day, provides significant benefits.

Obesity and metabolic disorders reduce healthy life expectancy

Obesity should be more accurately viewed not as a cosmetic sign of aging, but as a chronic disease that can accelerate the onset of conditions characteristic of older age. In 2025, the WHO officially described obesity as a chronic, relapsing disease arising from a complex interaction of genetics, neurobiology, behavior, and environment. [9]

Excess body fat is associated with hypertension, lipid metabolism disorders, type 2 diabetes, cardiovascular disease, certain cancers, osteoarthritis, and other conditions. The WHO estimates that a higher than optimal body mass index was associated with approximately 3.7 million deaths from noncommunicable diseases in 2021. [10]

From a biological perspective, it's not just the number on the scale that matters. Excess fat, especially visceral fat, can be associated with insulin resistance, chronic low-grade inflammation, lipid metabolism disorders, and vascular damage. The CDC, in its 2026 update, also emphasizes that obesity can cause long-term metabolic and inflammatory changes. [11]

However, this shouldn't be translated into a statement like "every extra kilogram adds so many years of biological age." Such a linear formula doesn't exist. Body mass index is only a rough indicator, and risk also depends on waist circumference, body composition, age, muscle mass, metabolic status, and underlying medical conditions.

Diabetes and high blood pressure are not just "age-related diseases"

Impaired glucose metabolism and hypertension can accelerate the accumulation of vascular and organ damage, so their treatment is important for maintaining a healthy lifespan.

In type 2 diabetes, chronically elevated glucose is associated with damage to blood vessels, kidneys, retinas, nerves, and the cardiovascular system. A recent review from 2026 also shows that diabetes is often accompanied by an acceleration of some epigenetic markers of aging; putative mechanisms include hyperglycemia, inflammation, and oxidative stress. However, epigenetic aging here is still a research indicator, not a diagnosis. [12]

Similar data are emerging with hypertension. A 2025 analysis found an association between high blood pressure and accelerated PhenoAge and several other biological indicators, with Mendelian randomization providing a signal in favor of a possible causal relationship. This design strengthens the argument, but does not, by itself, transform biological age into a clinical test. [13]

The practical conclusion is much simpler: control of blood pressure, glucose, and lipids is more important than trying to directly treat “biological age,” because the influence of these factors on heart attack, stroke, kidney disease, and other real-world outcomes is much better known.

An unhealthy diet accelerates the development of diseases, rather than “aging” you with one product.

There's no single food that "triggers aging" on its own. It's more reliable to talk about long-term dietary patterns.

The WHO's 2026 recommendations identify unhealthy diets as a major contributor to disease and disability. A healthy diet is based on a variety of minimally processed foods, vegetables, fruits, legumes, whole grains, and appropriate sources of protein. Limiting free sugars, excess salt, saturated fats, and trans fats is recommended. [14]

Ultra-processed foods are receiving particular attention. A 2025 meta-analysis of 18 prospective cohorts with over 1.1 million participants found that higher consumption of such foods was associated with higher overall mortality. However, these are observational studies and do not prove that the degree of processing itself is the sole cause of the effect, as ultra-processed foods also vary in their salt, sugar, fat, fiber content, energy density, and other characteristics. [15]

Therefore, the phrase "sugar accelerates aging" also requires clarification. Excessive consumption of free sugars can contribute to high energy intake, weight gain, and metabolic disorders, which is why the WHO recommends limiting free sugars to less than 10% of daily energy intake. However, one cannot calculate a person's biological age based on the number of spoonfuls of sugar consumed. [16]

A more useful question is not "which foods age you?", but rather what dietary pattern maintains normal weight, metabolism, blood vessels, muscles, and sufficient nutrient intake for decades.

Alcohol: A small amount is not an anti-aging strategy

Large quantities of alcohol are clearly harmful, and the argument that small doses prolong life appears significantly weaker today than it did several decades ago.

A meta-analysis of 107 cohorts with nearly 4.8 million participants found no statistically significant reduction in overall mortality in individuals with low or moderate average intake after more careful adjustment for bias. With higher intake, the risk of mortality increased. [17]

A 2024 Umbrella Review revealed why the literature remains inconsistent: results are highly dependent on the choice of control group and the quality of the study. The only systematic review with a low risk of bias in this analysis found a consistent increase in mortality with increasing consumption, rather than the classic "protective J-curve." [18]

For cancer, there is less uncertainty. The WHO and the International Agency for Research on Cancer indicate that there is no established safe level of alcohol in relation to cancer risk: the risk of some alcohol-related cancers begins to increase even with low consumption. [19]

This doesn't mean that one glass of wine instantly "adds years." But current evidence doesn't justify starting to drink alcohol for the sake of heart health, blood vessels, or longevity.

Poor sleep is linked to adverse aging, but it's easy to confuse cause and effect.

Regularly insufficient or disrupted sleep is detrimental to health, but the claim that "six hours of sleep directly accelerates brain aging" is too categorical.

The National Institute on Aging indicates that older adults, like other adults, typically need about 7-9 hours of sleep. Insufficient and poor-quality sleep is associated with poor memory, mood, and concentration, a greater risk of falls, and metabolic and cardiovascular problems. [20]

The association with dementia particularly highlights the issue of causality. A 2024 meta-analysis found an increased risk of dementia in people with short sleep in studies with relatively short follow-up periods, but the association was no longer statistically significant when followed for more than ten years. The authors suggested that short sleep may, in some cases, be an early manifestation of the future disease, rather than its cause. Long sleep was also associated with a higher risk, but studies varied greatly. [21]

This doesn't make sleep unimportant. Rather, the correct practical conclusion is this: chronic insomnia, sleep apnea, and persistent sleep deprivation should be treated as real medical problems, but the promise of "improving your sleep and reducing your biological age by five years" is unproven.

Air pollution is a factor in aging that cannot be corrected by willpower alone.

Exposure to fine particles and other pollutants is one of the largest environmental contributors to chronic disease. The WHO 2026 technical review identified air pollution as the leading environmental health risk, associated with an estimated 6.6 million deaths annually; noncommunicable diseases account for the majority of these deaths. [22]

Long-term exposure to air pollution is associated with damage to the respiratory and cardiovascular systems, stroke, and metabolic disorders. Children, the elderly, pregnant women, people with chronic diseases, and socially disadvantaged groups are particularly vulnerable. [23]

Molecular data has also emerged. A 2026 meta-analysis examined the association between long-term exposure to fine particulate matter, nitrogen dioxide, and black carbon and epigenetic aging. The results support this association, although the magnitude of the effect depends on the specific hours and pollutant. [24]

It's especially important here not to shift the blame entirely to humans. Air quality is determined by transportation, industry, urban planning, and the social environment. This is one example of how the rate of disease accumulation depends on more than just "good habits."

The social and physical environment also influences the trajectory of aging.

New research increasingly looks at the exposome—the sum of the physical, social, and economic influences a person experiences over a lifetime.

A Nature Medicine 2025 study included 161,981 people from 40 countries. Accelerated aging scores were associated not only with individual health but also with air quality, socioeconomic inequality, and other environmental characteristics. The resulting score also predicted subsequent decline in cognitive and physical function. The study was primarily observational, so it reveals a complex system of associations rather than a simple set of individual causes. [25]

In 2026, a similar international analysis of 18,701 people from 34 countries found that combined physical and social exposures were associated with rates of accelerated brain aging. Particularly significant was the fact that the combination of exposures explained more variance than any single factor. [26]

This changes the very understanding of "bad habits." A person may want to exercise more but live in a neighborhood without safe sidewalks; want to eat healthily but have limited access to quality food; experience chronic financial stress or work for years in a polluted environment.

Therefore, healthy aging is not solely a matter of personal discipline.

Chronic stress is indeed linked to accelerated biological aging, but the effect is not so simple.

Long-term psychosocial stress is detrimental to health, but the expression “stress ages you by ten years” is scientifically unfounded.

In August 2026, a systematic review and meta-analysis of 22 studies on psychological adversity in middle-aged and older adults was published. Stress, depression, and loneliness were associated with higher values of epigenetic age acceleration in several second-generation clocks—PhenoAge and GrimAge. [27]

However, the authors themselves specifically noted a key gap: it is still unknown whether successfully reducing psychosocial stress will lead to a proven slowing of epigenetic aging. Most of the data are observational, and stress is closely linked to sleep, physical activity, smoking, alcohol, diet, income, and chronic diseases. [28]

To explain accumulated physiological stress, the concept of allostatic load—the cumulative dysregulation of several body systems due to prolonged exposure to stressors—is used. Research shows a link between higher allostatic load and poorer health and mortality, but there is currently no universal diagnostic test for "body stress level." [29]

The practical significance of stress, therefore, is not to measure cortisol every month, but to treat chronic depression, anxiety disorders and insomnia and, if possible, to reduce long-term uncontrollable stressors.

Loneliness and social isolation are not only a psychological problem.

Social isolation is consistently associated with higher mortality, particularly in older adults. A 2025 meta-analysis of 86 longitudinal studies found an approximately 35% increase in overall mortality in socially isolated older adults and a smaller, but still statistically significant, association with loneliness. There was considerable heterogeneity across studies, so the effect size cannot be assumed to be universal for every individual. [30]

An earlier meta-analysis of 90 cohorts and over 2.2 million participants also found an association between social isolation and loneliness and overall mortality. However, these findings remain observational: isolation can simultaneously be a cause of poor health, a consequence of it, and a marker of other social problems. [31]

Recent data from 2026 further links isolation and loneliness with the development of frailty in older adults. This fits well with the concept of aging as a gradual loss of physiological reserve. [32]

Therefore, social contacts should be viewed not as a trendy “longevity hack,” but as one of the components of physical and mental health.

Ultraviolet light accelerates skin aging, but this is not the same as the aging of the body.

For the skin, solar ultraviolet radiation is indeed one of the most powerful external factors causing premature aging.

The WHO notes that chronic excessive ultraviolet exposure causes loss of skin elasticity, premature aging, and increases the risk of skin cancer. Ultraviolet A (UV) penetrates deeper into the skin and damages connective tissue, while ultraviolet B (UV) is particularly active in damaging the surface layers and DNA. [33]

Current research shows that photoaging involves DNA damage, oxidative stress, cellular senescence, and local chronic inflammation – mechanisms that partially overlap with general signs of aging.[34]

But the opposite conclusion shouldn't be drawn: the presence of wrinkles means that the heart, muscles, or brain have aged by the same amount. Photoaging is primarily the aging of the skin and eyes due to radiation, and not a universal measure of the age of all organs.

This is an important distinction because a person with minimal wrinkles may have severe metabolic disease, while a person with severe photoaging may still maintain good physical function.

Chronic inflammation

In popular anti-aging literature, the expression inflammaging – age-related chronic low-level inflammation – is often encountered.

In the updated model of the hallmarks of aging, chronic inflammation is indeed identified as one of twelve key mechanisms. It interacts with cellular senescence, immune dysfunction, metabolic changes, and other processes. [35]

But this doesn't mean that a healthy person should regularly get C-reactive protein tests and take anti-inflammatory drugs "for rejuvenation." Inflammaging remains a complex research concept, and its measurement and targeted treatment as a distinct condition have not yet been standardized. A contemporary clinical review from 2025 clearly points to the remaining gaps in diagnosis and treatment. [36]

It is much more beneficial to address the specific, proven causes of chronic damage: smoking, obesity, lack of exercise, gum disease, and other chronic conditions if present.

Does oxidative stress really “age” the body?

Oxidative damage is implicated in many age-related processes, but the idea that “free radicals = the sole cause of aging” has long been considered too simplistic.

The current model of aging includes twelve interrelated processes, among which oxidative stress may be involved in damage to mitochondria, DNA and proteins, but is not a stand-alone explanation for all of aging. [37]

Another important conclusion follows from this: it cannot be assumed that high doses of antioxidants automatically slow aging just because they reduce oxidation in the laboratory.

There is a long chain of clinical studies between the biochemical mechanism and the proven increase in healthy life expectancy.

Genetics influences the rate of aging, but does not cancel out environment

Some individual differences are indeed determined by heredity. Genetic variants influence susceptibility to cardiovascular disease, diabetes, certain types of cancer, neurodegenerative diseases, and potential longevity.

But modern geroscience increasingly pits genes against lifestyle. Research on the exposome shows that the state of the brain and the entire body is shaped by the interaction of hereditary vulnerability with pollution, social conditions, economic status, behavior, and diseases throughout life. [38]

Therefore, a family history of longevity does not protect against the consequences of smoking or uncontrolled blood pressure.

Conversely, the absence of centenarians in the family does not mean that reducing modifiable risks is useless.

Which of these has the greatest impact on actual healthy life expectancy?

There's no precise personal ranking because baseline risk varies from person to person. For a smoker, the first point is clearly different from a nonsmoker's; for someone with severe hypertension, controlling blood pressure is more important than optimizing meal timing; and in severe obesity, metabolic risk may outweigh minor dietary adjustments.

But at the population level, the evidence suggests several high-priority areas:

1. tobacco;
2. physical inactivity;
3. obesity and metabolic risk factors;
4. quality of food;
5. harmful use of alcohol;
6. air pollution;
7. medically significant sleep disorders;
8. social isolation and long-term psychosocial problems.

WHO actually uses similar logic for the prevention of non-communicable diseases and healthy ageing: maintain physical activity, eat a healthy diet, quit smoking, and control chronic disease factors. [39]

Why "biological age" is not needed to identify major risk factors

A commercial test might report that a person is 54 years old according to their passport and 59 according to their epigenetic clock. This seems very specific, but the medical interpretation is much more complex.

Different epigenetic clocks are trained on different endpoints and can predict different ages for a single individual. Some attempt to predict chronological age, others mortality or the rate of physiological change.

This is precisely why a factor can be considered important for aging even without proven changes in specific clocks. Smoking, for example, shortens lifespan so significantly that its clinical significance does not depend on whether the test shows +3 or +7 "biological years." [40]

Conversely, a small improvement in one epigenetic indicator does not necessarily mean that the risk of heart attack, cancer, dementia, or disability has decreased.

Therefore, for practical prevention, real risk factors and functional indicators are today more valuable than a single “biological age” number.

Rapid deterioration of the condition should not be attributed to aging.

Normal aging usually occurs gradually. A sudden decline in strength, rapid weight loss, sudden memory loss, severe weakness, or a rapid decline in exercise tolerance should not be automatically attributed to "rapid aging."

Such changes may be caused by anemia, thyroid disease, chronic infections, cardiovascular disease, diabetes, nutritional disorders, depression, drug side effects, lung disease, cancer, and many other conditions.

In such a situation, commercial biological age analysis is of little use. A standard medical assessment of the cause of the change in condition is required first.

The combination of unintentional weight loss, decreased muscle strength, and decreased appetite in an older person is particularly concerning because it may indicate malnutrition, frailty, or a medical condition that requires diagnosis.

How to reduce the impact of key factors

There's no need to restructure your entire life at once. It's most rational to start with the factor that poses the greatest individual risk.

If a person smokes, quitting is a very high priority. If blood pressure is regularly significantly elevated, diagnosis and treatment are more important than supplements. In cases of severe obesity and glucose imbalance, it makes sense to focus on metabolic health. If physical activity is almost completely absent, even regular walking and two strength training sessions per week can be more significant than a complex anti-aging diet.

It is reasonable to improve nutrition not by banning one “aging” product, but through structure: more vegetables, fruits, legumes and whole grains, sufficient protein and fewer products with excess free sugars, salt and unhealthy fats. [41]

Sleep should be considered a medical function. If a person consistently fails to sleep or snores with interruptions in breathing, the problem requires not a "restorative supplement," but an assessment for insomnia or sleep apnea. [42]

Personal influences on air pollution and social factors are limited, but that doesn't make them any less real. That's why modern research on healthy aging increasingly includes not only behavior but also living environment. [43]

What is often misunderstood

"Stress is the main cause of aging."

There is no evidence to suggest that stress is the sole or primary cause. Stress is associated with adverse health outcomes and some epigenetic clocks, but smoking, physical inactivity, chronic diseases, and pollution have a much more direct, well-documented link to serious clinical outcomes. [44]

"Sugar directly makes you look older"

This statement oversimplifies the situation. High intake of free sugars contributes to an unfavorable dietary structure and can contribute to weight gain and metabolic disorders, but there is no reliable formula for "so many grams of sugar = so many years of aging." [45]

"If a person looks young, his body is also young."

Not necessarily. Skin and internal organs age unevenly, and ultraviolet radiation can significantly alter the appearance of the skin, regardless of the state of the cardiovascular system or muscles. [46]

"Alcohol in small doses rejuvenates blood vessels"

Modern meta-analyses do not provide convincing evidence to recommend alcohol for the reduction of mortality, and no safe level has been established for cancer risk. [47]

"Lack of sleep directly causes dementia"

A link exists, but causality has not been definitively proven. With long-term observation, the association between short sleep and future dementia becomes weaker, suggesting reverse causality. [48]

"Inflammation can be measured by C-reactive protein alone and the rate of aging can be determined."

No. Chronic age-related inflammation is a complex, multi-component system, and there is no accepted clinical assay that measures inflammaging as a single diagnosis.[49]

"My biological age will show how quickly I'm aging."

Not with the precision often promised by advertising. Epigenetic and other timepieces remain primarily research tools, and different models reflect different risk aspects.

Key points from experts

Luigi Ferrucci, MD, PhD, is a geriatrician and epidemiologist, Scientific Director of the US National Institute on Aging, and Senior Investigator of its Longitudinal Studies Section. His research focuses on the mechanisms of gradual decline in physical and cognitive function and the development of age-related frailty. The NIA describes one of the central questions of his research as understanding why some people acquire significantly greater global vulnerability to disease and disability with age than others. [50]

This approach is important for the topic of accelerated aging because it shifts attention from a single laboratory marker to the accumulation of vulnerability, comorbidities, and loss of function. NIA healthy aging materials therefore emphasize physical activity, adequate nutrition, sleep, smoking cessation, and chronic disease management, rather than commercial "youth tests." [51]

Agustín Ibáñez, PhD, is a neuroscientist, director of the Latin American Brain Health Institute at Universidad Adolfo Ibáñez and professor of Global Brain Health at Trinity College Dublin/Global Brain Health Institute. His current research program includes the impact of the physical and social exposome on brain aging and dementia in different countries. [52]

International research by a group co-led by Ibáñez has shown that adverse brain aging is not linked to a single factor, but to a combination of physical and social influences. The authors emphasize the need to study heredity and environment together, rather than as independent causes. [53]

Frequently Asked Questions

What accelerates the aging process most?

In terms of actual clinical consequences, the most important modifiable factors include smoking, physical inactivity, obesity and metabolic disorders, unhealthy diet, harmful use of alcohol and air pollution. [54]

Does Lack of Sleep Accelerate Aging?

Poor sleep is associated with poor physical and cognitive health, but there is no precise formula to translate chronic sleep deprivation into “years gained.”[55]

Does stress really make you age?

Chronic stress is associated with acceleration of some epigenetic markers of age, but stress treatment has not yet been shown to directly reduce biological age.[56]

Does smoking affect biological age?

Yes, it is associated with both an acceleration of epigenetic age and, much more importantly, a major reduction in life expectancy and a multitude of diseases. [57]

Does alcohol accelerate aging?

High consumption increases mortality and the risk of many diseases. Even small consumption cannot be considered a proven anti-aging practice, and a safe dose for cancer risk has not been established. [58]

Does excess weight make you look older?

Obesity increases the risk of earlier development of diabetes, cardiovascular disease, certain cancers, and functional limitations. However, BMI cannot be directly translated into "biological years." [59]

Does the sun age the entire body?

First of all, it accelerates photoaging of the skin and damages the eyes; excessive ultraviolet exposure also increases the risk of skin cancer. This is not equivalent to accelerated aging of all internal organs. [60]

Can air pollution cause accelerated aging?

Long-term air pollution is associated with serious chronic diseases and premature mortality. Research also finds a link with some indicators of epigenetic aging. [61]

Does loneliness really affect life expectancy?

Observational studies have fairly consistently linked social isolation and loneliness with increased mortality, but some of the association may be explained by health status and other social factors.[62]

Is there a way to find out if I am aging faster than normal?

Research into biological clocks exists, but there is no universal medical test that reliably measures the rate of aging throughout the body and determines treatment.

Is it possible to repair the damage that has already accumulated?

Some risk does indeed decrease with behavioral changes or treatment of risk factors. A striking example is smoking cessation: even quitting in midlife significantly improves life expectancy compared to continuing to smoke. [63]

Main

Accelerated aging is best understood as a more rapid accumulation of diseases, physiological vulnerabilities, and functional limitations, rather than as a single digit of biological age. The most compelling contributors to this are tobacco, physical inactivity, obesity and associated metabolic disorders, poor nutrition, significant alcohol consumption, and an unfavorable environment. [64]

Chronic sleep problems, long-term stress, depression, and social isolation also play a role, but the studies here are more often observational and the causality is more complex. They should not be presented as mathematical "biological age accelerators." [65]

Most known factors act through more than one mechanism. They can simultaneously increase inflammation, impair metabolism, damage blood vessels, increase the risk of cancer, reduce muscle function, and diminish physiological reserve. This is why modern geroscience views aging as a network of interconnected processes. [66]

For humans, the practical priority is usually not to find a rare "geroprotector," but to eliminate one's greatest personal risk: not smoking, staying active, maintaining muscle strength, treating blood pressure and metabolic disorders, maintaining a good diet and sleep, and minimizing harmful environmental influences where possible. This approach currently has a significantly stronger evidence base for preserving healthy life years than attempts to manipulate a single indicator of biological age. [67]