16 is the minimum age for getting an adult job in most states and provinces across the globe.
24 is the number of frames per second at which motion picture film is usually projected.
31 is the number of musical triads (12 major, 12 minor, 4 diminished, and 3 augmented).
39 is the duration, in nanoseconds, of the nuclear reaction in the largest nuclear explosion ever performed (Tsar bomb).
43 is the maximum number of cars participating in a NASCAR race in the Cup Series or Nationwide Series.
47 is the total numbers of balloons that a player can collect in Rareware's Nintendo 64 game Diddy Kong Racing.
17 is the minimum driving age for a car or van in the United Kingdom.