General fact: 60 is the number of miles polar bears have been known to swim without a rest.
Mathematical fact: 60 is the smallest number divisible by 1 through 6.
Trivia: 60 is the highest obtainable level on World of Warcraft (not including expansions).
Historical date: February 29th is the day in 1712 that February 29 is followed by February 30 in Sweden, in a move to abolish the Swedish calendar for a return to the Old style.