General fact: 60 is the total number of years in a Sexagenary cycle.
Mathematical fact: 60 is the sum of a pair of twin primes (29 + 31), as well as the sum of four consecutive primes (11 + 13 + 17 + 19).
Trivia: 60 is the years of marriage until the diamond wedding anniversary.
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.