Metabolic age is a guide to how active your metabolism is, compared to a normal healthy person of the same age and gender. We estimate your metabolic age by comparing your metabolic rate against average metabolic rates for different age groups of the population.
As we grow older, our metabolism tends to slow down. However, exercise can increase your metabolism and have beneficial health effects. Fat does not require much energy to live, whereas muscle is in constant need of energy, even at rest. The faster your metabolism, the quicker you burn off excess fat. Therefore, building muscle mass and improving your metabolic rate, is an important aspect in reducing your body fat mass and overall percentage.