What Is Metabolic Age?
Metabolic age is a concept that compares your basal metabolic rate (BMR) to the average BMR for your chronological age group. If your metabolic age is lower than your actual age, it suggests your metabolism is functioning like that of a younger person. If it's higher, your metabolism is operating more like an older person's — a potential warning sign.
The calculation works by estimating your BMR using standard formulas, comparing it to population averages for different ages, and finding which age group has the most similar BMR. This gives you a single number: your metabolic age.
How It's Calculated
BMR is estimated from your weight, height, sex, and age using the Mifflin-St Jeor equation. This BMR is then compared to population reference data showing average BMRs for each age decade. The age group whose average BMR most closely matches yours determines your metabolic age.
Use our metabolic age calculator to get your estimate.
Does It Matter?
Metabolic age is a reasonable proxy for metabolic health, but it's not a medical diagnosis. A higher metabolic age might indicate that you have less muscle mass than average for your age (since muscle burns more calories at rest), which is genuinely associated with health risks. Improving your metabolic age through strength training and better body composition is a worthy goal.
However, don't treat it as a precise medical measure. It uses estimated BMR formulas, population averages, and simplified comparisons. What matters more: your actual body composition, blood markers, fitness level, and how you feel.
How to Lower Your Metabolic Age
Build muscle through resistance training (muscle tissue has a higher metabolic rate than fat). Maintain consistent physical activity. Ensure adequate protein intake. Get enough sleep. Manage stress. These are the same things that improve health in general — metabolic age is just one way to track your progress.