In the sport that produces the hardest of hard bodies, nobody is harder than Dara Torres. She set her first U.S. record in the 50 freestyle when she was 15. In 1981! Torres won medals at the Olympics in 1984, 1988, 1992, 1996 and 2008. And she's angling to make the 2012 team, where most of the team will be younger than her Olympic career.
If she makes it to London, she will be by far the most accomplished woman swimmer in U.S. history. She'll be 45 at the Games. And still super-hot.