Most of us lose energy as we age; by 60, we're no longer able to run around freely or dance all night like we did in our 20s.
But of course, there are exceptions to this rule, and 49-year-old Milind Soman is one major exception.
On July 19, the Indian actor-turned-model-turned-fitness enthusiast completed the famed Ironman Triathlon -- a 140.6-mile race -- in just over 15 hours.
This year's race, held in Zurich, Switzerland, boasted over 2,000 athletes.
To earn the title of Ironman, participants must complete an 112-mile bike ride, a 26.2-mile run (that's a full marathon) and a 2.4-mile swim in under 16 hours.
In his first time competing, Soman clocked in at 15 hours and 19 minutes.