Your biological age may be very different from your calendar age. Answer questions about your habits and find out how old your body really is.
What is biological age?
Biological age (also called physiological age) measures how old your body is based on its actual condition — not the date on your birth certificate. Two people who are both 40 years old chronologically can have very different biological ages depending on their lifestyle habits, genetics, and health history.
How is biological age calculated?
This calculator uses research-backed adjustments for 12 lifestyle factors including exercise, sleep, diet, smoking, alcohol, stress, social connections, and BMI. Each factor adds or subtracts years from your chronological age based on published longevity and aging research. The result is an estimate — not a medical diagnosis.
Can you reverse your biological age?
Yes — studies show that consistent lifestyle changes can measurably reduce biological age markers within months. Quitting smoking, improving sleep quality, adding regular exercise, and reducing chronic stress have the strongest documented effects.
Frequently Asked Questions
What’s the difference between biological and chronological age?
Chronological age is simply how many years you’ve been alive. Biological age reflects the actual state of your cells, organs, and body systems — which can be older or younger than your calendar age depending on lifestyle factors.
Which habits have the biggest impact on biological age?
Research consistently shows that smoking, physical inactivity, chronic stress, and poor sleep have the largest negative effects. Conversely, regular exercise, 7–9 hours of quality sleep, and strong social connections have the strongest positive impact on longevity.
Is this calculator medically accurate?
This is an estimate based on published research about lifestyle factors and aging. It is not a medical test or diagnosis. For a clinically accurate biological age assessment, consult a doctor or use laboratory-based biomarker testing.
How quickly can you change your biological age?
Some improvements are rapid — stress reduction and sleep improvements can affect cellular markers within weeks. Quitting smoking starts improving biological age within days and continues for years.