Diana Nyad is among the older athletes running marathons, scaling mountains and otherwise putting the rest of us to shame.
Martina Navratilova (56) -- A tennis legend already, she won a mixed doubles championship at the U.S. Open just shy of her 50th birthday and won the senior doubles title at Wimbledon at the age of 53. At 55, she went outside of her comfort zone and competed on "Dancing With The Stars."
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