I am 52 years old. I think I've taken care of myself pretty well. I exercise regularly--jogging or swimming for an hour or so three times a week. I eat fairly healthfully--a lot of fruit and vegetables. I have a loving family and a stimulating job. But I am at about the age when human bodies, no matter how well cared for, begin to lose the youthful vitality most of us at one time thought would be with us for the duration. Besides the obvious changes like hair loss and wrinkling, the lungs' capacity declines; joints start to wear out; bones,...
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