Turn your Apple Watch into a biological age coach
My Bio Age pairs with Apple Watch to show all four key metrics at a glance—biological age, recovery, stress resilience, and circadian alignment. Color-coded status indicators (green/yellow/red) give you instant feedback on your wrist, backed by 6 months of data.
Four key metrics on your wrist
All four key metrics are now available on Apple Watch with color-coded status indicators (green/yellow/red) for instant feedback. Swipe between quick metric pills and detailed views—syncs via Bluetooth with offline caching.
- MyBioAge Index with trend direction and status color.
- Recovery Capacity with Ready/Moderate/Limited indicators.
- Stress Resilience Score (0-100) with color-coded zones.
- Circadian Alignment Score (0-100) with instant status feedback.
Color-coded feedback at a glance
Each metric shows green, yellow, or red status indicators so you know instantly where you stand. No need to open the app for details—your wrist tells you if stress resilience is strong, circadian rhythm is aligned, or recovery needs attention.
- Green: optimal range—keep doing what you're doing.
- Yellow: room for improvement—check the AI Coach for insights.
- Red: needs attention—review trends and adjust habits.
- All backed by 6 months of your health history for accuracy.
Built for Apple Watch athletes and everyday movers
Whether you are training for a marathon or building healthier routines, the MyBioAge Index helps you gauge if you are adapting well. Use it to anchor conversations with coaches, doctors, or to fuel personal experiments around sleep, stress, and fueling.
What you will see on Apple Watch
- MyBioAge Index with color-coded status and trend direction.
- Stress Resilience and Circadian Alignment scores (0-100).
- Recovery Capacity with Ready/Moderate/Limited indicators.
- All metrics synced from 6 months of your health history.
How the Apple Watch biological age app works
- Install My Bio Age on iPhone and Apple Watch, then connect Apple Health.
- Allow VO2 max, heart rate variability, sleep, and activity permissions.
- Wear Apple Watch through workouts and overnight for the richest dataset.
- Review the MyBioAge Index each morning to guide training and recovery choices.
- Use weekly digests and habit nudges to keep your biological age trending lower.
Apple Watch sensors that shape your biological age
My Bio Age listens to every reading your Apple Watch streams, but four inputs carry the most weight inside the MyBioAge Index. Nurture each one to keep your functional age on a positive trajectory.
- VO2 max: Reflects aerobic capacity; steady zone 2 work keeps this rising.
- HRV: Higher variability signals strong nervous system recovery.
- Resting heart rate: Lower is usually better and hints at parasympathetic balance.
- Sleep quality: Deep and REM ratios show whether you are rebuilding nightly.
Pro tip
Calibrate Apple Watch once a month with an outdoor walk or run. Accurate stride length and heart rate readings make every MyBioAge Index update more precise.
Choose your next biological age experiment
Lower your MyBioAge Index
Use weekly digests to spot which habits shrank your biological age and double down on them.
Test a new training block
Compare HRV and VO2 max trends after adding tempo work, intervals, or strength blocks.
Dial in recovery rituals
Track the impact of breathwork, cold exposure, or earlier bedtimes on next-day readiness.
Ready to turn Apple Watch data into a younger biological age?
Install My Bio Age, connect Apple Health, and start lowering the MyBioAge Index with science backed coaching.
Apple Watch biological age FAQs
How does My Bio Age calculate biological age from Apple Watch data?
My Bio Age reads VO2 max, heart rate variability, resting heart rate, sleep stages, and active energy from Apple Health. The app normalizes each metric against your baseline and combines them into the MyBioAge Index, a functional age score that updates every time new Apple Watch data syncs.
Do I need to wear my Apple Watch all day for biological age tracking?
Wearing your Apple Watch for workouts, sleep, and recovery windows produces the most accurate MyBioAge Index. Short breaks are fine, but consistent wear ensures the app sees your full VO2 max, HRV, and sleep trends.