While it's true that your metabolic rate generally decreases with age, it's largely due to a corresponding decrease in muscle mass, which in turn slows down the rate at which you burn calories; however, there's no reason that age needs to lead to a slower metabolism as long as you stay active and eat healthy. (fitbodyhq.com)
Advanced cases will often show a visible decrease in the muscle mass over one hip. (texaswestveterinarian.com)
«We start losing muscle naturally from our thirties, and from a decrease in muscle mass you get a decrease in resting metabolic rate,» says Inge. (womenshealthandfitness.com.au)