Free tool

Biological Age Calculator

How old is your body, really? Answer 12 quick questions to estimate your biological age and get wellness, recovery and longevity scores with personalized next steps.

About 2 minutes 12 research-backed factors Scored privately in your browser By Live10X Editorial Team Reviewed September 26, 2026

Step 1 of 3 · Your basics0%

At a glance

Key takeaways

Biological age estimates how old your body seems, not how many birthdays you've had.
Smoking, activity, diet, sleep, alcohol and body composition have the strongest links to longevity.
This calculator is an educational estimate — clinical tests use DNA methylation or blood biomarkers.
Your top recommendations target the habits with the biggest potential impact first.

How it works

How to estimate your biological age

1
Enter your basics
Add your age, sex, height and weight. Height and weight are used to calculate BMI.
2
Describe your habits
Choose the options that best match your exercise, sleep, alcohol, smoking and stress.
3
Add nutrition and recovery
Tell us about your water intake, diet quality and recovery routine.
4
Unlock your results
Enter your name and email to see your estimated biological age, wellness, recovery and longevity scores and personalized recommendations.

The calculator starts with your chronological age, then adds or subtracts years for each habit based on the size of its association with longevity in large studies — smoking and physical activity carry the most weight, hydration the least. Adjustments are capped so no single answer dominates. Read the full approach in our research methodology.

The science

What affects biological age the most?

Factor	Evidence	Why it matters
Smoking	Strong	Large cohort studies link smoking with roughly a decade of lost life expectancy, and quitting — especially before 40 — recovers most of it.
Exercise	Strong	Cardiorespiratory fitness and daily activity are consistently associated with lower all-cause mortality in large cohorts.
Diet quality	Strong	Global Burden of Disease analyses rank poor diet among the leading modifiable contributors to death and disability.
Sleep	Strong	Both short and very long habitual sleep are associated with higher mortality risk; 7–9 hours is the consensus recommendation for adults.
Alcohol	Strong	A pooled analysis of nearly 600,000 drinkers found risk rising with intake above roughly 100 g of alcohol a week (about 7 U.S. drinks).
Body composition	Strong	Meta-analyses of millions of adults link both underweight and obesity with higher mortality, with the lowest risk around a BMI of 20–25.
Stress	Moderate	Chronic psychological stress is associated with inflammation, poorer sleep and higher cardiometabolic risk.
Recovery habits	Moderate	Adequate rest, sleep and load management support training adaptation and reduce overuse injury risk.
Hydration	Moderate	Even mild dehydration can affect mood, attention and physical performance; needs vary with climate and activity.

The bottom line

Biological age reflects how your body is aging, and lifestyle is a major lever. This calculator estimates it from 12 research-backed factors and shows which habits to prioritize. For a lab-based measure, look at epigenetic or blood-biomarker tests — and discuss results with a clinician.

FAQ

Biological age calculator FAQs

What is biological age?

Biological age is an estimate of how old your body seems based on markers of health and function, rather than the number of birthdays you've had. Two people born the same year can age at different rates depending on genetics, lifestyle and environment.

How accurate is this biological age calculator?

It's an educational estimate based on lifestyle factors with strong links to longevity in large studies. It doesn't measure your cells, blood or DNA, so it can't replace clinical testing — but it's a useful way to see which habits are likely helping or holding you back.

How is biological age measured clinically?

Researchers use epigenetic clocks based on DNA methylation (such as Horvath's clock and PhenoAge), algorithms built from routine blood biomarkers, and physical measures like VO2 max and grip strength. Learn more in our biological age guide.

Can you lower your biological age?

Research suggests healthy habits are associated with younger biological-age estimates, and small trials have reported changes in epigenetic age after diet and lifestyle programs. Results vary and no outcome is guaranteed, but the same habits reliably support healthspan.

Which factors affect biological age the most?

In large studies the biggest modifiable factors are smoking, physical activity and fitness, diet quality, sleep, alcohol intake and body composition, followed by stress and recovery habits.

Is my information private?

Your answers are scored in your browser. We only store your name, email and results if you submit them to unlock your full report. See our privacy policy.

Why do you ask for my name and email?

Your name and email unlock your full report and add you to the free Live10X Briefing — one evidence-informed longevity insight a week. You can unsubscribe anytime.

Longevity · GuideBiological Age: What It Is, How It's Measured and How to Improve ItWhat is biological age? Learn how epigenetic clocks and blood-based tests estimate it, how accurate they are, and the habits associated with slower biological aging.Longevity · ComparisonBiological Age vs. Chronological Age: What's the Difference?Chronological age counts years; biological age estimates how your body is aging. Learn how each is measured, why they diverge and how to influence biological age.Longevity · GuideLongevity Habits: 12 Daily Practices Linked to a Longer HealthspanThe daily longevity habits with the strongest evidence — movement, strength, sleep, diet quality, connection and more — plus a sample longevity day and how to make habits stick.Longevity · HubLongevity: The Science of Living Longer, Stronger and BetterA science-informed guide to longevity: healthspan vs. lifespan, the hallmarks of aging, biological age, the habits with the strongest evidence, and which trends are still unproven.

Read the complete biological age guide

Citations

Sources & references

[1]Impact of healthy lifestyle factors on life expectancies in the US populationLi Y, Pan A, Wang DD, et al.. Circulation, 2018 · Cohort studyView source : Impact of healthy lifestyle factors on life expectancies in the US population (opens in a new tab)
[2]21st-century hazards of smoking and benefits of cessation in the United StatesJha P, Ramasundarahettige C, Landsman V, et al.. New England Journal of Medicine, 2013 · Cohort studyView source : 21st-century hazards of smoking and benefits of cessation in the United States (opens in a new tab)
[3]Risk thresholds for alcohol consumption: combined analysis of individual-participant data for 599 912 current drinkers in 83 prospective studiesWood AM, Kaptoge S, Butterworth AS, et al.. The Lancet, 2018 · Meta-analysisView source : Risk thresholds for alcohol consumption: combined analysis of individual-participant data for 599 912 current drinkers in 83 prospective studies (opens in a new tab)
[4]Body-mass index and all-cause mortality: individual-participant-data meta-analysis of 239 prospective studies in four continentsGlobal BMI Mortality Collaboration. The Lancet, 2016 · Meta-analysisView source : Body-mass index and all-cause mortality: individual-participant-data meta-analysis of 239 prospective studies in four continents (opens in a new tab)
[5]Sleep duration and all-cause mortality: a systematic review and meta-analysis of prospective studiesCappuccio FP, D'Elia L, Strazzullo P, Miller MA. Sleep, 2010 · Meta-analysisView source : Sleep duration and all-cause mortality: a systematic review and meta-analysis of prospective studies (opens in a new tab)
[6]Daily steps and all-cause mortality: a meta-analysis of 15 international cohortsPaluch AE, Bajpai S, Bassett DR, et al.. The Lancet Public Health, 2022 · Meta-analysisView source : Daily steps and all-cause mortality: a meta-analysis of 15 international cohorts (opens in a new tab)
[7]Health effects of dietary risks in 195 countries, 1990-2017: a systematic analysis for the Global Burden of Disease Study 2017GBD 2017 Diet Collaborators. The Lancet, 2019 · Systematic reviewView source : Health effects of dietary risks in 195 countries, 1990-2017: a systematic analysis for the Global Burden of Disease Study 2017 (opens in a new tab)
[8]An epigenetic biomarker of aging for lifespan and healthspanLevine ME, Lu AT, Quach A, et al.. Aging (Albany NY), 2018 · Cohort studyView source : An epigenetic biomarker of aging for lifespan and healthspan (opens in a new tab)

Study links open a PubMed search for the exact title, so they keep working even if a journal changes its URL.

Our partner store

Shop 10X Health

Genetic testing, the 10X Health System and daily supplements — straight from the official 10X Health store. Save 10% through our links.

Shop the store

Affiliate disclosure: Live10X is an independent educational site. If you purchase through our 10X Health links, we may earn a commission at no extra cost to you. It never changes what we write. Read our affiliate disclosure.

See everything we cover

These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease.

Stop guessing. Start with data — and a plan.

Take the free wellness assessment to find your highest-leverage focus areas, then explore genetic testing when you're ready to personalize further.

Take The Wellness Assessment Shop 10X Health · Save 10%Explore Genetic Testing

“Shop 10X Health” is an affiliate link — we may earn a commission at no extra cost to you. Affiliate disclosure