Diana Nyad is among the older athletes running marathons, scaling mountains and otherwise putting the rest of us to shame.
Eileen Philippa 'Phil' Raschker (66) -- This accountant holds 68 gold medals at the World Masters Athletics Championships and 22 World Masters Records for both outdoor and indoor events, and is considered one of the best athletes in the world. She's also a two-time Sullivan Award finalist.
Enrique Castro-Mendivil / Reuters
U.S. National Archives
REUTERS/ Stefano Rellandini
U.S. Air Force
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