Rock and Roll started dying right after Frampton’s Comes Alive album. It was killed when Lionel Richie and Michael Jackson (thru CBS records) forced MTV to play their stuff (MTV died at that time too, imho).
I think it started dying around the Sgt. Pepper time period when these guys all started thinking they were “artists.” But, for me, the mid-90s was about it so give rock a 40-year run.
Like a cat, there appears to be much more than one life to it. The “and roll” part is often considered superfluous language today. It’s just called rock, or rawk if it is particularly rawkous.
Oh, and the trend now seems to be to dress up like a biker on Halloween.