It is in middle age that many health problems first occur, although their true cause may have begun in the young adulthood years. Young adults may smoke, drink heavily, stay up late, and get dark...

It is in middle age that many health problems first occur, although their true cause may have begun in the young adulthood years. Young adults may smoke, drink heavily, stay up late, and get dark tans, and the wear and tear that this lifestyle causes on their bodies will not become obvious until their forties and fifties.