Nathan Adrian and Joseph Gordon-Levitt
Nathan Adrian won gold in Beijing at the age of 19 in the 4x100m relay. This year, at the age of 23, he's won 2 more golds (100m and 4x100m medley) and 1 silver (4x100m freestyle). His quasi-doppelgänger is Joseph Gordon-Levitt, who pretty much can't go wrong these days.The guy in Nolan's Inception and The Dark Knight Rises, but he's soon to appear in another action flick co-staring the legendary Bruce Willis.