Biological Age Estimator
See how your lifestyle stacks up against your chronological age.
How this estimate is derived
- Model:
- Weighted lifestyle-factor model, with each factor anchored to ranges reported in published aging and mortality research and interpolated linearly
- Implementation last reviewed:
- 2026-08-29
- Purpose:
- Educational estimate only; not a lab-measured biological age and not a clinical diagnosis.
How this is calculated
Starting from your chronological age, each lifestyle factor you enter adds or subtracts years based on ranges from published biomarker and cohort-aging research — exercise, sleep, BMI, smoking, diet quality, stress, and alcohol consumption. The factor breakdown shows exactly how much each input contributed, and the top-3 list highlights where to focus first.
Using this calculator's defaults — a 40-year-old with 150 minutes/week of exercise, 7 hours of sleep, a BMI of 24, non-smoker, good diet, medium stress, and 5 alcohol units/week — most of the individual factor adjustments land close to neutral, since these defaults sit near the middle of most published reference ranges. Moving any single factor to its higher-risk end (e.g. becoming a smoker, or BMI rising into the obese range) typically produces the largest single swing in the estimate. This same factor-based approach underpins the Alcohol Health Impact calculator and the Longevity Estimator, which apply similar published dose-response research to individual lifestyle factors.
Frequently asked questions
- What is "biological age"?
- A statistical estimate of how old your body behaves compared to people your chronological age, based on lifestyle factors correlated with aging outcomes in published research — not a lab-measured value like an epigenetic clock test.
- Where do the factor weights come from?
- Each factor (exercise, sleep, BMI, smoking, diet, stress, alcohol) is scored using ranges derived from published biomarker and cohort-aging studies, anchored to the endpoints reported in that research and interpolated linearly in between — the same approach used by the Longevity Estimator.
- How do I improve my score?
- The "top factors to improve" list shows the 3 inputs currently adding the most years to your estimate, ranked by impact.
- What is biological age?
- Biological age is an estimate of how old your body behaves based on lifestyle and health factors, as opposed to chronological age, which is simply how many years you've been alive. Two people of the same chronological age can have meaningfully different biological ages depending on exercise, sleep, diet, smoking, and other habits.
- What factors have the most impact on biological age?
- Smoking status and BMI tend to have some of the largest single-factor effects in published research, followed by exercise frequency and alcohol consumption. Sleep and stress typically have smaller, though still meaningful, effects. The "top factors to improve" list in your result ranks these by their actual impact on your specific inputs.
- Can biological age be reversed?
- This estimate is based on modifiable lifestyle factors, so improving those factors (quitting smoking, exercising more, improving diet, reducing alcohol) would lower the estimated biological age in this model. Whether biological aging itself is reversible in a deeper physiological sense is an active area of scientific research beyond what a lifestyle-factor calculator can capture.
- How does biological age relate to life expectancy?
- The lifestyle factors that drive this biological age estimate are the same ones that drive the lifestyle-adjustment model in the Longevity Estimator — a lower biological age relative to chronological age generally corresponds to a higher estimated life expectancy in that companion tool.
- What is the difference between chronological age and biological age?
- Chronological age is a fixed, objective count of years since birth. Biological age is a modelled estimate of how your body is aging relative to that timeline, based on measurable or reported health and lifestyle factors — it can be higher or lower than your chronological age.