Excerpt from: About.com (click for full article)
When you think of how your body is aging, it's probably the most visible changes that come to mind. Maybe you've noticed more gray hair, or your skin doesn't seem as smooth as it used to be. These are just external signs of a series of processes going on within your cells and bodily systems that together constitute normal aging.
While this is one of the few experiences all humans have in common, the National Institutes of Health say aging is actually one of nature's least understood processes. Here are some of the leading theories about how time affects your personal biology:
Aging is pre-programmed.
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