Diana Nyad is among the older athletes running marathons, scaling mountains and otherwise putting the rest of us to shame.
Herschel Walker (51) -- An 11-year stint in the NFL apparently wasn't enough for Walker, who's now a mixed martial arts fighter at age 51. In his MMA debut in 2010, he defeated Greg Navy via technical knock-out.
Kayana Szymczak/Getty Images
Courtesy: UW-La Crosse Professor Greg Wegner
20th Century Fox Television
Courtesy of National Football League
Sean Gallup/Getty Images
David Buchan/Getty Images
Jim Rogash/Getty Images
Ethan Miller/ Getty
TIMOTHY A. CLARY/AFP/Getty Images
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