Diana Nyad is among the older athletes running marathons, scaling mountains and otherwise putting the rest of us to shame.
Ernestine Shepherd (76) -- She is the oldest competitive female bodybuilder in the world, as declared by the Guinness Book of World Records in 2010 and 2011.
REUTERS/San Lorenzo soccer club/Handout
iStock / Alija
John F. Martin/General Motors
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