Some people like to argue that decades are nothing more than arbitrary demarcations of time. But if I were to ask you to free-associate, and if I were to say the Fifties, the Sixties, the Seventies, the Eighties, the Nineties, et cetera, certain songs and movie scenes and sartorial flourishes would arise in your mind for each one.
No one would confuse the 1950s with the 1970s, except maybe in the case of Happy Days. No one would confuse the 1970s with the 1990s, except maybe in the case of the Weezer video for “Buddy Holly” in which the band members were inserted into a scene from Happy Days. Decades have signature styles and moments. Some great hand of American culture does seem to hit reset every ten years.