14. Dara Torres
This 12-time Olympic medallist had a stunning career. She was the first elite swimmer to qualify for five Olympics. Torres achieved this over a two-decade career. Her longevity is all the more remarkable when you factor in that she medaled in each of those tournaments.
Torres was the oldest swimmer in the history of the US national team when she competed in Beijing at the age of 41. This came a couple of years after the birth of her first child. She went on to win three silver medals, putting younger athletes to shame.