How to check your biological age estimate with Apple Watch
My Bio Age uses available Apple Health data to calculate a weekly wellness estimate on iPhone. Follow this checklist to review your MyBioAge Index™ and view the latest scores in the companion watch app. It is not a clinical test.
Step-by-step: how to check biological age on Apple Watch
- Download the free My Bio Age app for iPhone and Apple Watch from the App Store. No in-app purchases or subscription.
- 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 refresh available data and review your weekly MyBioAge Index™.
- Open the companion Apple Watch app while your iPhone is reachable to receive the latest scores.
Start with the free app
Download My Bio Age free on the App Store and choose your Apple Health permissions. No account, subscription or in-app purchases. Your health data stays private, with scoring and optional AI processing entirely on iPhone. Your first Index needs enough data from a complete Monday-to-Sunday week.
Metrics that drive the MyBioAge Index
The MyBioAge Index™ combines 12 health inputs, or 14 with blood pressure. These examples help explain what data to review. Stress Resilience and Circadian Alignment are separate daily scores, not Index inputs.
- VO₂max: Available cardio-fitness estimates from Apple Health.
- Heart rate variability: Available SDNN readings and their trend over time.
- Resting heart rate: Readings considered with your wider health history.
- Sleep: Duration and regularity derived from available sleep records.
Check your data before interpreting a score
- Check that the expected reading appears in the Apple Health app.
- Check the permissions you have chosen for My Bio Age.
- Review data sources and dates, especially if you use more than one device.
- Open My Bio Age on iPhone to refresh available data.
What you get when you check biological age on Apple Watch
Weekly Index
Review your Index for the latest complete week on iPhone, then open the watch app to receive the latest value.
Daily scores
Explore Recovery, Training Load, Stress Resilience, and Circadian Alignment when the required data is available.
Weekly Digest
Enable the Monday 10 AM notification to review your in-app weekly summary. Changes show trends, not proof of which habit caused them.
Start checking your biological age on Apple Watch today
Download My Bio Age for free, connect Apple Health and review your available data privately on iPhone. No subscription or in-app purchases. If readings are missing, start with our troubleshooting guide.