What is Bio Age?
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.
How is it measured?
DNA methylation clocks analyse chemical tags on your DNA to estimate your biological age with remarkable accuracy.
Explore the clocks
Tap each bio age measurement to learn more.
This step is interactive — open the Thier app to try it.
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.
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.
8-Week Bio Age Reversal
See how lifestyle changes compound over 8 weeks.
This step is interactive — open the Thier app to try it.
Key Takeaway
Biological age is the most meaningful number for longevity. The goal: make your bio age consistently lower than your chronological age.