People shrink as they age because the vertebrates in the spine lose fluid and flatten. Over the years, the arches of the feet flatten, causing a person to be a little shorter. Most people lose muscle mass in middle to later life, and that affects posture. The more a person slouches, the shorter he or she appears.
In order to prevent age-related shrinking, regular exercise is necessary. Workouts geared toward core strengthening and those that work the legs and hips are important. Foods containing calcium and vitamin D also help.Learn more about Human Anatomy