Longevity · Guide
AI longevity estimates: what they can and can't tell you.
How AI turns habits, lab results, photos and wearable data into ageing estimates — and why an honest estimate shows its inputs and its limits.
By Aziz Mezlini, PhD · Founder & Scientist, Carthalis · Updated 2026-05-25
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 AI longevity estimates are
AI longevity tools estimate how you are ageing from patterns in data — habits, blood tests, photos of your face, fitness and sleep. Done well, they show you which inputs drive the estimate and which habits could move it. Done badly, they are "death clocks": one dramatic number from a quiz, with no sources.
| Estimate | What it is | What it isn't |
|---|---|---|
| Biological age | How old your body seems, from habits and health markers | A lab ageing clock or a diagnosis |
| Life expectancy | How long people like you tend to live | A prediction of your own lifespan |
| Face age | An AI estimate of how old your face looks | A medical assessment of your skin |
What you can change
- Not smoking, regular activity and strength training
- A good diet and moderate alcohol
- Enough regular sleep
- Blood pressure, cholesterol and blood sugar — with your doctor
Age, genes and many health events are outside your control, so every estimate has a wide margin. Use them for motivation, and talk to your doctor about health decisions.
How it's calculated, sources and more
How Carthalis estimates it
Each estimate in your Digital Twin uses a published method and appears only when you have shared what it needs. Life expectancy then builds on them together.
| Estimate | Built from | Source |
|---|---|---|
| Epigenetic age | Life's Essential 8: habits, blood pressure, cholesterol, 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 |
| Ear age | A guided tone test with headphones | Puangpipat 2021 |
| Face age | A photo you choose to share | AI model — validation in progress |
| Life expectancy | Your age, sex and the estimates above | Li 2018 |
You can try two of these now without an account: the biological age calculator and the life expectancy calculator.
Common questions
See all your ageing estimates in one place
Create a free account to follow biological, heart, fitness, blood, ear and face age — and life expectancy — as you share more.