Free biological age calculator – no blood test, no sign-up
BioAge.io is a free biological age calculator: no blood test, no sign-up, about 60 seconds, and everything runs in your browser. It estimates how your habits compare, and it is not a medical test.
Biological Age Assessment
Your BioAge.io result
Great job!What affected your score
Sorted by impact. Orange adds years, green takes years off.
Educational lifestyle estimate, not a medical test. Your answers are saved only in this browser.
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Biological age vs. chronological age
Your chronological age is simple: the number of years since you were born. Your biological age is an estimate of how old your body behaves – how well your heart, metabolism, muscles and cells are holding up. Researchers use it because two people with the same birthday can age at very different speeds.
A biological age below your calendar age suggests your habits are working in your favor. A higher number is a signal, not a sentence: many of the drivers are everyday choices you can change.
How this calculator works
We believe in being transparent. This is a simple lifestyle-based estimate, not a lab test. It starts with your chronological age and adds or subtracts years for six everyday habits. There are no hidden formulas:
See sources and limits for how each habit is supported by research, and what the research does not show.
Anything not listed counts as neutral (0). The result is rounded to one decimal. Example: a 50-year-old who sleeps 7.5 hours, exercises 5+ days a week, eats Mediterranean-style, has low stress, has never smoked and drinks within low-risk guidelines gets a biological age of 41.
| Factor | Your answer | Effect |
|---|---|---|
| Sleep | 7–8 hours | −1 year |
| Sleep | Less than 6 / more than 8 hours | +1 year |
| Exercise | None / 1-2 / 3-4 / 5+ days | +3 / 0 / −2 / −3 |
| Diet | Processed / Mixed / Whole-food | +3 / 0 / −2.5 |
| Stress | 9–10 (high) | +2 years |
| Stress | 1–3 (low) | −1.5 years |
| Smoking | Never / Quit / Currently | −1 / 0 / +3 |
| Alcohol | None / Within low-risk guidelines / More | 0 / 0 / +2 |
What moves the number
Sleep
Both short and very long sleep are linked to older-looking biology in research. A steady 7–8 hours is a great target for most adults.
Exercise
Regular movement is among the strongest predictors of healthy aging. Mix cardio with strength training to protect muscle.
Diet
Whole-food and Mediterranean-style eating patterns are consistently associated with longer, healthier lives. Ultra-processed food points the other way.
Stress
Chronic stress keeps stress hormones elevated and disrupts sleep. Daily recovery habits – walks, breathing, connection – help.
Smoking
Never smoking is one of the low-risk habits in large long-term studies. If you smoke, quitting at any age is a powerful step.
Alcohol
Staying within low-risk drinking guidelines, or not drinking at all, keeps this factor in your favor.
Want practical protocols for each of these? HealthyAgers.com shares science-backed healthy aging tips for people 50+.
Frequently asked questions
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 have had. Two people who are both 50 can have very different biological ages depending on genetics, lifestyle and health history.
How accurate is this biological age calculator?
This calculator is a simple, transparent lifestyle estimate. It starts from your age and adds or subtracts years for six habits: sleep, exercise, diet, stress, smoking and alcohol. The years are the site's own simplified weights; they are not measured in your body and are not taken from a single study. It is not a lab test and cannot measure your cells. Use it as a snapshot of your habits, not as a diagnosis. See how the calculator works and what the research shows.
Can I lower my biological age?
Many of the habits that push a biological age estimate up can be changed. Getting 7 to 8 hours of sleep, exercising most days of the week, eating a mostly whole-food or Mediterranean-style diet, managing stress, not smoking and keeping alcohol within low-risk guidelines all move the number in the right direction in this calculator. Research on lifestyle and biological ageing points the same way, although studies measure different things (see the methodology).
How is biological age measured in a lab?
Lab-based tests use biomarkers such as DNA methylation patterns (epigenetic clocks), routine blood markers (for example PhenoAge) or glycans on antibodies. Results differ between methods, and each test measures something slightly different. This free calculator does not replace those tests.
Is my data stored or shared?
No. Your answers are calculated in your browser and saved only in your own browser's local storage, so the calculator can restore them on your next visit. Nothing is sent to our servers. Use the Retake button or clear your browser data to remove them.
How often should I retake the test?
Retake it whenever your habits change, for example after a month of better sleep or a new exercise routine. Because the calculator only reflects lifestyle inputs, your result changes as soon as your habits do.
Disclaimer: BioAge.io provides an educational estimate based on self-reported lifestyle habits. It is not a medical device, diagnosis or medical advice. Talk to a qualified healthcare professional before making changes to your health, diet or exercise routine.