The sixth decade of a century: the 1850s, 1950s, 2050s, etc.
I will probably be dead by the fifties.
In the past few years, fifties diners have sprung up all over town.
1954 June, R. Marchant, “Early Excursion Trains”, in Railway Magazine, page 427:
The fifties were the heyday of the excursion train, with the 1851 Exhibition naturally giving a great boost to such traffic.
2025 August 5, Danny Goldberg, “A Guest Post By Danny Goldberg: Culture, Empathy And Resistance”, in DownWithTyranny, archived from the originalon23December 2025: