• •FitAge provides an open-source framework using 8 physical tests to calculate a user's functional age.
• •The project seeks to standardize biometric tracking beyond traditional medical markers.
• •Validation of the testing protocols against long-term health outcomes remains incomplete.

FitAge has launched an open-source platform that calculates functional age through eight standardized physical performance tests. Unlike proprietary fitness wearables that rely primarily on heart rate and sleep data, this approach prioritizes mobility and strength metrics. However, the system currently lacks peer-reviewed clinical validation, leaving users to rely on self-reported test accuracy. Whether this model provides a reliable indicator of biological health depends on how the community refines its scoring algorithms against broader longitudinal data.