Longevity · Free calculator
Biological age calculator: how old do your habits make you?
Estimate your biological age from five everyday habits in a minute — and see what it means, what it can't tell you, and how to go further.
By Aziz Mezlini, PhD · Founder & Scientist, Carthalis · Updated 2026-05-25
Five of Life's Essential 8 — diet, activity, nicotine, sleep and BMI — scored with the American Heart Association tables, then converted to an epigenetic-age estimate (McCrory 2021). Runs on this page; nothing is stored.
Estimate your biological age (lifestyle proxy)
Based on the 5 behavioural components of the AHA's Life's Essential 8 score, mapped to an epigenetic-age proxy using the McCrory 2021 NHANES regression coefficient. Wellness education — not a DNA-methylation panel.
Your inputs
Your result
Fill in your inputs to see your personalised result here. The calculator runs entirely on this page — no signup required to try.
Lifestyle-derived projection, not a DNAm panel (Horvath, Hannum, PhenoAge, GrimAge). Wellness education, not diagnosis.
Sign up for the full 8-component LE8 in the app, which also factors in lipids, glucose and blood pressure when you share them — and tracks the trajectory over time.
Save your result with a free accountThis is a lifestyle projection, not a DNA-methylation measurement (Horvath, Hannum, PhenoAge, GrimAge clocks all require lab assays). Your Digital Twin uses all eight parts — including blood pressure, cholesterol and blood sugar — when you share them.
This is one small piece of Carthalis. The app tracks 140+ insights from your own data — sleep, labs, nutrition, fitness and more — explains what they mean, and helps you act on what matters.
See everything Carthalis does →What biological age means
Biological age estimates how old your body seems compared with your age in years. Two people born the same year can differ by a decade, mostly because of habits, fitness and health markers.
| Term | What it means |
|---|---|
| Age in years | Time since you were born — fixed. |
| Biological age | An estimate from habits and health markers — it can move as they change. |
| Lab ageing clocks | Measured from DNA methylation in a blood test — a lab assay, not this calculator. |
What it can't tell you
- It is an estimate from five habits, not a measurement of your cells.
- It leaves out blood pressure, cholesterol and blood sugar — the other three parts of Life's Essential 8.
- Use it for motivation, and talk to your doctor about your lab results and health decisions.
How it's calculated, sources and more
Method and sources
The calculator scores five of the American Heart Association's Life's Essential 8 (Lloyd-Jones et al., 2022) — diet, physical activity, nicotine, sleep and BMI — and converts the score into an epigenetic-age estimate using the association reported by McCrory et al. (2021) in NHANES data. Everything runs in your browser; nothing is stored.
| In your Digital Twin | Built from | Source |
|---|---|---|
| Epigenetic age (full Life's Essential 8) | Habits plus blood pressure, cholesterol and blood sugar | McCrory 2021 |
| Heart age | Your heart-risk score, blood pressure and body size | D'Agostino 2008 |
| Fitness age | Estimated VO₂max | Loe 2013 |
| Blood age | Standard blood test results | Levine 2018 |
Each estimate appears only when you have shared what it needs — what you tell us about your health, lab results, logs and devices (optional).
Common questions
See your full biological age picture
Create a free account to follow your biological age over time — with heart, fitness and blood age as you share more.