Fitness age
Cardiorespiratory fitness translated into an age comparison.
AI-assisted editorial draft · Source check: 6 September 2026 · Independent reviewer: not yet assigned
What it measures
A fitness measure or estimate compared with age-related reference values. It does not measure whole-body molecular aging.
Source 1: Norwegian University of Science and Technology / CERGRequired inputs
Depending on the method, directly measured or estimated VO₂max, physical activity, resting heart rate and body measurements.
How it was developed
NTNU’s CERG fitness calculator is an example of a research-based fitness estimation approach.
Source 1: Norwegian University of Science and Technology / CERGOutcome associations
Cardiorespiratory fitness has been studied in relation to health outcomes. The evidence for the input measure should not be transferred automatically to every age-branded display.
Source 1: Norwegian University of Science and Technology / CERGLimitations
Estimation error, exercise history and the selected reference population can change the age comparison.
Can you calculate it yourself?
Some research calculators accept non-exercise inputs. A measured exercise test and a questionnaire estimate are different measurements.
Commercial use
No fitness-age provider profile is verified yet. See NTNU’s own explanation for its calculator.
Source 1: Norwegian University of Science and Technology / CERGSources & verification
- Fitness calculator and research
Norwegian University of Science and Technology / CERG · Accessed 2026-09-06