
THE DIFFERENT PATTERNS OF AGING
The landmark investigation at the National Institute on Aging is revealing that rather than just "declining," we change in several discrete ways as the years advance. One aging pattern is not to change at all. Although this happens with some bodily functions, the primary examples are not in the physical arena but in the mental one. Personality and, in some important respects, intelligence tend to stay stable at least until advanced old age.
In another common pattern loss does occur, but only when a person develops an age-related illness. For instance, whereas it had been thought that in his middle and later years a man's body generally produces less and less testosterone (the male sex hormone); the Baltimore researchers found declining testosterone levels only in older subjects who were physically ill.
In yet a third pattern a loss does universally occur, but our body compensates physiologically for the change so we can function almost as well as ever. A fascinating example is the brain. As the years pass, individual brain cells are constantly lost; but the cells that remain make up for this erosion by becoming more robust. They grow new branches and new interconnections to compensate, and our thinking is preserved.
So the traditional view of aging as irreversible loss is wrong. A good deal of what seemed to be deterioration caused by being sixty or seventy turns out to be caused by being an ill sixty- or seventy-year-old. Many changes once seen as inevitable are potentially more reversible than anyone ever thought. And even when the years themselves take a physical toll, our bodies are surprisingly resilient. We have the capacity to grow and adapt in some surprising areas (such as the brain) where scientists never believed growth could occur after maturity.
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GENERAL HEALTH
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