Aging clocks

Biological age, epigenetic clocks and biomarkers of aging.

60 answers, from 359 studies

Last updated: July 2026

Key questions

Does plasma exchange (plasmapheresis) work against ageing?

There are initial, cautiously positive indications from one small study, but it is too small and too influenced by commercial…

Preliminary evidence

Does calcium-AKG lower your biological age?

Reliable evidence that calcium-AKG lowers biological age in humans is still lacking. The widely cited claim of 8 years younger…

Preliminary evidence

Why does the risk of cancer increase with age?

The older you get, the more damage accumulates in your cells and the worse your body becomes at repairing or detecting that…

Can you lengthen your telomeres through lifestyle?

Lifestyle most likely cannot fully reverse telomere shortening, but quitting smoking, eating healthily and exercising are…

Preliminary evidence

Does your body age faster after a prolonged period of stress?

Prolonged stress demonstrably accelerates biological ageing through multiple measurable mechanisms. Reducing stress,…

Does your body odour change as you get older?

Yes, your body odour changes from around your forties onwards because a substance forms on your skin that is barely detectable…

How reliable are the biological age tests you can buy online?

The available studies offer no answer to this question; whether online biological age tests are reliable cannot be inferred…

Does your resting heart rate say anything about how fast you are ageing?

A structurally high resting heart rate, certainly above 80 to 90 beats per minute, is associated with a clearly higher risk of…

Can an epigenetic age test really tell you how old your body is?

An epigenetic age test provides a meaningful indication of biological ageing, but is not yet a definitive verdict on your…

Moderate evidence

Does the country you live in affect your biological age?

Where you live and how much money you have is strongly associated with how quickly you age biologically; the largest gap…

Can you see how fast you are ageing from your stool?

Your microbiome does change with age and is associated with health risks, but a reliable ageing test based on stool does not…

Moderate evidence

Do your kidneys age at a different rate than your liver?

The kidney ages in a measurable and predictable way, but whether that happens faster than the liver cannot be determined based…

Can you influence your epigenetic age through diet?

Eating healthily is associated with a lower epigenetic age, but whether changing your diet truly turns back the clock has not…

Preliminary evidence

What does too much sitting do to your biological clock?

Too much sitting demonstrably weakens your day-night rhythm, even after just one day. Moving more, and preferably in the…

Does loneliness accelerate your biological age?

Whether loneliness accelerates your biological age at the cellular level cannot be determined from the available studies.…

Can meditation do anything about ageing at the cellular level?

There are cautious indications that meditation may slow telomere shortening, but the results are inconsistent and the evidence…

Preliminary evidence

Can you see your biological age in your blood pressure?

Your blood pressure, and especially your nighttime blood pressure, says something about how your blood vessels are ageing, but…

How reliable is a saliva test for biological age?

A saliva test for biological age via DNA methylation provides a reasonable estimate with a margin of error of approximately 4…

Can your microbiome reveal how old you are biologically?

Your gut microbiome demonstrably changes with the years and is associated with healthy ageing, but as a biological age marker…

What is DunedinPACE and what does it tell us about ageing?

DunedinPACE measures how quickly you are biologically ageing and is associated with disease and mortality, but whether…

Does someone with diabetes age faster biologically?

Yes, diabetes noticeably accelerates biological ageing: the risk of cardiovascular disease, dementia, and premature death…

Which blood values tell you something about how quickly you are biologically ageing?

Blood values such as protein profiles, DNA methylation patterns, telomere length and common inflammatory markers each provide…

What does alcohol do to your biological age?

Heavy and chronic alcohol use accelerates biological ageing through inflammation, liver damage and changes to cell membranes.…

Is it true that women age more slowly than men, biologically speaking?

Women live longer on average and have a slightly lower biological age, but that advantage is not visible across all areas: the…

Can meditation slow down your biological clock?

There are tentative indications that regular meditation is associated with slower biological ageing, but the evidence is still…

Preliminary evidence

Does your biological age advance differently at night than during the day?

Your body does not age faster at night than during the day, but the night is the primary recovery period and that recovery…

Does the time of day you eat affect how quickly you age?

There are serious indications that eating early, fasting for 10-14 hours overnight and avoiding night-time snacks are…

Preliminary evidence

What is the Horvath clock and why is it so well known?

The Horvath clock was the first biological age measure that worked broadly across virtually all tissues, and that is what…

How quickly can you change your biological age with exercise?

Exercise can produce biologically measurable improvement, but how quickly and by how much depends heavily on what you measure:…

Preliminary evidence

Can a blood test show how old your organs are?

Blood tests can provide an estimate of biological ageing and flag the risk of specific conditions, but they cannot yet…

Does your skin age faster than your organs?

There is no direct evidence that the skin ages faster than your internal organs, but the skin does have a specific and…

What does smoking do to your biological age?

Smoking measurably accelerates the biological ageing of lung cells, the immune system and the reproductive system. Quitting…

Can fasting reverse your biological age?

The provided source contains no data on fasting and biological ageing, so this question cannot be answered on the basis of…

Insufficient evidence

What does an epigenetic clock actually measure?

An epigenetic clock reads chemical tags on your DNA and translates them into a biological age estimate. The further that…

Does insulin resistance accelerate ageing?

Insulin resistance is associated with measurably faster biological ageing, greater muscle loss, and possibly a higher risk of…

Yes · Moderate evidence

How do telomeres protect your DNA?

Telomeres protect your chromosome ends through a system of proteins that simultaneously prevents false alarms and harmful…

Can you lengthen or restore your telomeres?

Fully restoring or lengthening telomeres has not yet been demonstrated in humans. Vitamin D3 (2000 IU/day) did measurably slow…

Moderate evidence

Why do your telomeres get shorter as you age?

Telomere shortening is part of life: every cell division costs a piece. But smoking, chronic stress, and sleep deprivation…

Does NAD+ supplementation slow biological aging?

NAD+ supplements demonstrably raise your NAD+ levels and appear to be safe, but whether they slow biological ageing has not…

Preliminary evidence

What is the difference between living longer and living longer in good health (healthspan)?

Healthspan and lifespan are two separate things: you can live a long time yet lose years to illness and decline. Caloric…

What does the stress hormone cortisol do to my ageing?

Chronically elevated cortisol accelerates muscle loss and disrupts your metabolism, and that effect is real. Good sleep and…

Can you have your telomeres measured, and is there any value in doing so?

Having your telomeres measured is possible, but the result of a commercial blood test is difficult to interpret. Measurement…

Yes · Moderate evidence

Do I inherit my life expectancy from my parents?

You inherit a biological advantage from long-lived parents, but genes account for only approximately 39% of differences in…

Do some people age primarily through their heart and others through their metabolism?

Yes, people age through different organ pathways. The science needed to map this precisely for each individual is promising,…

Can you tell someone's biological age from their face?

Your face does emit biological signals, but it is too limited and too variable to measure your biological age accurately. Take…

Does everyone age at the same rate, or do people truly age at different speeds?

At the molecular level everyone ages at a broadly similar baseline rate, but in terms of health and life expectancy people…

Does my walking speed say anything about how fast I am aging?

Yes, your walking speed says something about how your body is ageing. People who walk slower than 0.8 to 1.0 metres per second…

How large can the difference between my chronological age and my biological age be?

The typical spread between your biological and calendar age is around one to two years. Studies mention no hard upper limit,…

What is young blood / plasma exchange, and does it actually work?

Young blood and plasma exchange produce fascinating results in mouse studies, but clinical evidence in humans is lacking.…

Preliminary evidence

Does hyperbaric oxygen therapy help against ageing?

HBOT shows interesting signals in small, early studies regarding telomere length and cerebral blood flow, but the evidence is…

Preliminary evidence

Are commercial biological age tests based on DNA methylation worth the money?

Commercial biological age tests measure something real, but the clocks regularly contradict one another. The translation into…

Preliminary evidence

Can you really lower your biological age, and does the research support this?

There are promising indications that biological age is measurable and perhaps controllable, but clinical evidence that you can…

Preliminary evidence

How reliable are epigenetic clocks for measuring your biological age?

Epigenetic clocks are reliable instruments for measuring biological age and predict mortality better than calendar age. They…

Which lifestyle factors influence your biological age the most?

Exercise is the most powerful brake on biological ageing. A Mediterranean diet, good sleep and less stress also help, but the…

Moderate evidence

What does your VO2max say about how fast you are ageing?

A higher VO2max is strongly associated with lower mortality and a more favourable biological age, but is more of a gauge of…

How can I measure my biological age?

An epigenetic clock test gives you a useful reference point for tracking your biological age over time, but you cannot yet…

Preliminary evidence

How does ageing work and how can you slow it down?

Ageing is well described biologically, but there are no proven means of genuinely slowing it in humans yet. For now, focus on…

Yes · Moderate evidence

Are biological age tests actually accurate?

Whether a biological age test is reliable depends entirely on what it measures: brain-scan models for depression perform no…

Preliminary evidence

What are telomeres and can I keep them longer?

Keeping telomeres longer sounds appealing, but more telomerase or longer telomeres also carry risks, because cancer cells use…

Yes · Strong evidence

Does stress make you age faster?

Prolonged stress demonstrably accelerates your biological aging. Healthy lifestyle habits that reduce physical and oxidative…

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