Time takes a toll on your body

Each decade after age 25 you lose 4 % of your muscle mass. After age 40, you lose 1 % a year. Some individuals lose more. Metabolism starts to slow down in your late twenties, which makes it easier to put on weight, which adds stress to your bones and joints. But...on the plus side... vigorous exercise SLOWS THE LOSS OF MUSCLE.

Ralph Santarsiero