- Teenagers today live far healthier, more prosperous and promising lives than ever before. Life expectancy for 15-year-olds today is 77 years compared with 62 at the beginning of the century. Such killers as typhoid, cholera, polio, and smallpox now pose only minimal threats to American teens' health. Per capita income has increased eight-fold over the course of the century, and things once considered luxuries such as telephones, televisions, CDs...
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