About the Biological Age Estimator
What is the Biological Age Estimator?
Your biological age reflects how your lifestyle and health affect your risk compared with others of the same age. This estimator converts the effect of each factor on mortality risk into equivalent years of ageing.
Because the risk of death roughly doubles every 8 years of adult life, a habit that doubles risk, such as smoking, adds about 8 years to your biological age.
How to use the Biological Age Estimator
- Age (years) (sample: 40)
- Tobacco (sample: Never)
- Exercise (sample: Some regular activity)
- BMI (Asian Indian cut-offs) (sample: 23–24.9 (overweight))
- Sleep (sample: 7–8 hours)
- Blood Pressure (sample: Normal)
- Blood Sugar (sample: Normal)
- Diet (sample: Average)
- Press Estimate Biological Age (results also refresh as you type). The result card shows the Estimated Biological Age, along with Difference from your actual age, Biggest factor and Method.
Formula used
Biological age = Actual age + Σ ln(Hazard ratio) ÷ 0.085
- Hazard ratio = relative risk of death for each factor, from large cohort studies
- 0.085 = yearly rise in adult mortality risk (Gompertz slope)
An educational estimate, not a lab test such as an epigenetic clock.
Worked example
These are the sample values already filled in the calculator above, and the result it returns for them:
| Input | Sample value |
|---|---|
| Age (years) | 40 |
| Tobacco | Never |
| Exercise | Some regular activity |
| BMI (Asian Indian cut-offs) | 23–24.9 (overweight) |
| Sleep | 7–8 hours |
| Blood Pressure | Normal |
| Blood Sugar | Normal |
| Diet | Average |
| Result | Value |
|---|---|
| Estimated Biological Age | 41.1 years |
| Difference from your actual age | +1.1 years |
| Biggest factor | Body weight |
| Method | Each risk factor's hazard ratio is converted into equivalent years of ageing (mortality doubles about every 8 years) |
Tips for using the Biological Age Estimator
- Quitting tobacco has the biggest single effect for smokers.
- Regular exercise can make your biological age several years younger than your actual age.