Vierziger

Etymology
From.

Noun

 * 1) Anything defined by the number forty, especially:
 * 2) A bus, train, etc. with that number.
 * 3) A player, candidate, etc. with that number.
 * 4)  The forties of a given century.
 * 5)  The forties of a given life.
 * 6) A person in their forties.