Reading on the web. Open in the Thier app for the interactive version, progress tracking, and XP.
Open

What is Bio Age?

4-minute read 20 XP in app 7 cards

Your cells have their own clock

Biological age measures how old your body actually functions — not how many birthdays you've had. Right now your bio age is {bioAge} vs a chronological age of {chronoAge} — a gap of {bioAgeDelta} years. Two 40-year-olds can have bio ages of 32 and 52.

Fact

How is it measured?

DNA methylation clocks analyse chemical tags on your DNA to estimate your biological age with remarkable accuracy.

Try in app

Explore the clocks

Tap each bio age measurement to learn more.

This step is interactive — open the Thier app to try it.

Try in app

Estimate the range

How many years can bio age vary between people of the same chronological age?

This step is interactive — open the Thier app to try it.

Insight

You can reverse your bio age

Studies show that lifestyle interventions (diet, exercise, sleep, stress management) can reverse biological age by 3-8 years in just 8 weeks.

Try in app

8-Week Bio Age Reversal

See how lifestyle changes compound over 8 weeks.

This step is interactive — open the Thier app to try it.

Takeaway

Key Takeaway

Biological age is the most meaningful number for longevity. The goal: make your bio age consistently lower than your chronological age.