Check your biological age each day with My Bio Age
Apple Watch captures the data you need. My Bio Age translates it into a functional age score that updates automatically. Follow this checklist to make sure every sync delivers accurate MyBioAge Index readings.
Step-by-step: how to check biological age on Apple Watch
- Install My Bio Age on iPhone and Apple Watch from the App Store.
- Grant Apple Health permissions for VO2 max, HRV, resting heart rate, sleep, and activity.
- Wear Apple Watch through workouts and sleep to collect high-quality data.
- Open My Bio Age on iPhone to sync and review the latest MyBioAge Index each morning.
- Use the Apple Watch app or complication to view your biological age trend in real time.
Need the app?
Install My Bio Age, sign in, and your first biological age reading will appear as soon as Apple Watch data syncs.
Metrics that drive the MyBioAge Index
The MyBioAge Index blends multiple Apple Watch signals so you always know what is improving or holding back your biological age.
- VO2 max: Measures aerobic power; more zone 2 training raises the score.
- Heart rate variability: Highlights nervous system recovery and stress.
- Resting heart rate: A low, stable RHR signals positive adaptations.
- Sleep quality: Deep and REM sleep ratios show rebuilding efficiency.
Tips for accurate readings
- Wear Apple Watch a bit looser at night to improve HRV accuracy.
- Calibrate monthly with an outdoor walk to tighten VO2 max estimates.
- Tag strength and mobility work correctly to avoid skewed activity data.
- Open My Bio Age after workouts to confirm sync status.
What you get when you check biological age on Apple Watch
Real-time index
View your MyBioAge Index on the watch complication or open the app for full trendlines.
Habit nudges
Receive subtle reminders to hydrate, recover, or move based on how your metrics shift.
Weekly digestion
Get a Friday summary that ranks the habits which lowered your biological age the most.
Start checking your biological age on Apple Watch today
Download My Bio Age, connect Apple Health, and let the MyBioAge Index keep you accountable to a younger biological trajectory.