About.com: Strength Training Over Age 50
In general, as people grow older, their muscle fibers shrink in number and in size (atrophy) and become less sensitive to messages from the central nervous system. This contributes to a decrease in strength, balance, and coordination. Although there is no question that people experience at least some of these declines at about age 40, the extent to which they occur depends on a number of factors, including genetics, diet, smoking and alcohol use, and -- most important -- physical activity level.
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