What it is: Your biological age based on four biomarkers that predict all-cause mortality risk. True Age tells you what age your body is actually functioning at, independent of the years you've been alive.
The foundation of longevity: True Age measures your body's biomarkers across cardiovascular and metabolic health. True Age components are the scientifically validated foundation of longevity on which everything else is built. Without a strong foundation (good VO2max, resting heart rate, HRV, and muscle mass), advanced optimization strategies won't deliver lasting results.
The four biomarkers:
VO2max - cardiovascular fitness
Resting heart rate - cardiovascular efficiency
Heart rate variability - stress resilience and autonomic health
Lean body mass index - muscle mass and metabolic health
Data requirements:
Lookback window: Past 4 complete weeks (Monday to Sunday)
Updates: Every Monday with data from the previous 4 full weeks
RHR and HRV: Need 4+ days with readings across the 4 weeks
VO2max and LBMI: Need at least 1 reading across the 4 weeks
Confidence levels: High, Medium, or Low based on data completeness and recency for each biomarker
What it means:
True Age Pace of AgingWhat it is: Whether you're aging faster or slower than the clock. Pace of Aging is a multiplier that shows your recent rate of biological aging. How it works: reThrive calculates a stable trend using linear regression over at least 4 weeks of True Age measurements. This eliminates noise from week-to-week variations and gives you a reliable baseline. Data requirements:Minimum: 4 weeks of True Age measurementsCalculation window: Linear regression over up to 16 complete weeks of True Age dataUpdates: Every Monday alongside True Age updatesWhat it means:Above 1.0x = True Age increasing faster than chronological age (time to act)1.0x = True Age increasing at the same rate as the clockBetween 0.0 and 1.0x = True Age is increasing slower than your chronological age (good)Negative = rejuvenating, your True Age is decreasing (very good) Thrive LeversWhat they are: Six specific actions organized into three pillars that directly impact your biomarkers and True Age. The six levers: MovementNon exercise activity time / Daily stepsLight activity (HR Zone 1-3 time)PerformanceVigorous activity (HR Zone 4-5 time)Strength training durationRecoverySleep durationSleep consistencyHow they work: Each lever impacts one or more of your four biomarkers. reThrive analyzes which biomarkers need the most improvement and shows you which levers to pull for maximum impact. Status: Levers are coming soon. Once live, you'll see personalized recommendations based on your specific biomarker data. Data requirements summary
Metric | Minimum data | Lookback window | When available |
True Age | 4+ days RHR/HRV, 1+ reading VO2max/LBMI | 4 complete weeks | Immediately if you have historical data, or after 1 week |
Pace of Aging | 4+ weeks of True Age measurements | Up to 16 complete weeks | Immediately if you have historical data, or after 4 weeks |
Thrive Levers | True Age available | N/A | Coming soon |
