Michael Phelps won his 20th and 21st gold medals Tuesday night, extending his record for the most golds of any Olympian ever. His win in the 200 meter butterfly made him the first person to win individual swimming gold in Olympic games 12 years apart. He also became the oldest man to win individual swimming gold, breaking a 96-year-old record set by Hawaiian surfing legend Duke Kahanamoku in 1920.


But there is an even older record he now has in his sights: