Metabolic age refers to the fact that the older you get, the lower your metabolic rate is, reflecting your body’s basal metabolic level. Metabolic age is based on a formula for basal metabolism, which is calculated somewhat differently for men and women. When calculating metabolic age, men and women are different. Adult male: basal metabolic rate = 66 + {13.7 x body weight (kg)} + {5 x height (cm)} – {6.8 x age (years)} and adult female: basal metabolic rate = 655 + {9.6 x body weight (kg)} + {1.8 x height (cm)} – {4.7 x age (years)}. Basal metabolic rate varies physiologically with sex and age. Basal metabolic rate is on average higher in men than in women, and higher in early childhood than in adulthood; the older the age, the lower the metabolic rate. In general, it is normal for the actual value of the basal metabolic rate to be within 10-15% of the normal average. Only when it exceeds 20% of the normal value can it be considered a pathological condition. It is recommended that if you feel sick, you should consult a doctor in time and take standardized treatment under the guidance of a professional doctor.