At around age forty, a lot of interesting physiological changes begin to take place in a person's body. Learn how and why:

• hair begins to turn gray and thins
• skin becomes drier and more wrinkled
• the shape of the body begins to change
• eyes and ears don't work as well as they used to
• menopause hits both women and men

It's at this age, too, that lifestyle choices both current and past begin to show their real impact. Yet many find making changes in diet and exercise can be terribly difficult at this stage of life. Why is this, and what can be done? In Physical Development, we take a broad look at these issues and reveal how middle adulthood can, in fact, be the best time of life if approached properly.