Sarcopenia. A common aging byproduct is sarcopenia, or loss of muscle mass. By age 40, men usually have lost 1-5% of their muscle mass, caused by the gradual loss of muscle cell function [R]. This loss accelerates with age and, when left unmonitored, results in fragility and interference with physical activity.

What happens to guys as they get older?

Aging changes in the male reproductive system occur primarily in the testes. Testicular tissue mass decreases. The level of the male sex hormone, testosterone decreases gradually. The prostate gland enlarges with age as some of the prostate tissue is replaced with a scar like tissue.

What is the meaning of life begins at 40?

Prov. By the time you are forty years old, you have enough experience and skill to do what you want to do with your life. (Often said as an encouragement to those reaching middle age.)