As we get older, the amount and distribution of body fat, lean muscle mass, bones and water will change. Fat tends to gather towards the body’s center, especially around the abdominal organs. Body fat can increase by 30% or more due to aging processes.
This change in body fat amount also decreases our amount of lean muscle mass. Muscles, as well as other organs in the body, can lose cells as we age, called atrophy. Bones, too, lose minerals and become less dense. Loss of bodily tissue also decreases the amount of water found in the body as we age.
In addition to gaining fat, losing muscle, losing bone density, and losing water, many people lose height as they age. It has been estimated that people lose up to a half inch of height every decade after they turn 40. After age 70, you can lose up to three inches of height! Height can affect weight distribution as we age as well.
Men might gain weight until they reach the age of 55, when testosterone levels drop and they start losing weight. Women often gain weight until they are 65, then lose weight due to losing muscle tissue.