Metabolic Age
BMR vs. Age Cohort
Compare your BMR to the average for your age — a quick engagement check of metabolic fitness.
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What Metabolic Age Means
Your metabolic age answers a simple question: if someone in the general population had your BMR, how old would they typically be? A 35-year-old with the BMR of a typical 28-year-old has a metabolic age of 28 — seven years younger than they look on paper.
Why BMR Matters
This matters because BMR decline with age is not inevitable. Most age-related BMR loss is driven by muscle loss (sarcopenia), not time itself. People who maintain lean mass through resistance training routinely keep metabolic ages 10-15 years below their chronological age well into their 60s and beyond.
Tips & Limitations
BMR accounts for 60-75% of the calories you burn in a day
Every pound of muscle burns ~6 cal/day at rest; fat burns ~2
Lean mass is the strongest single predictor of BMR
Age-related metabolic slowdown is real but smaller than most people think
Lift weights: 2-4 sessions per week focused on compound movements
Eat enough protein: 0.7-1 g per pound of bodyweight supports muscle retention
Sleep 7-9 hours: muscle recovery and hormonal balance depend on it
Stay active: NEAT (non-exercise activity) meaningfully raises total energy expenditure
Manage body fat — excess fat crowds out lean tissue over decades