Growing up in the 70's and 80's we used to watch a TV show called Happy Days that was about a group of high school students in the 50's. We considered the fifties to be some ancient time in the past barely accessible within the memories of the really old people who may still have been alive. The music seemed ancient and quaint. The fashions were preposterous, silly and so alien that some of the girls used to dress up as a "fiftie's girl" for Halloween, much like one might dress up as a renaissance courtesan (which are really stupid choices for Halloween costumes since neither of them is scary).
In retrospect the Happy Day's setting only preceded us by about twenty years. I went to high school in the eighties which is now about twenty years ago. The kids today must think of the eighties as some magical ancient time when people dressed liked idiots and listened to really lame music. Do they look through my high school yearbooks when considering Halloween costumes?