I remember reading the following quote about music in the 1950s and 60s: "Prior to this era, there was no distinction between music adults and teenagers listened to. E.g. Frank Sinatra was popular with multiple age demographics. Starting in the late 1950s, being a cool teenager meant that you liked music that was different than what your parents listened to. This was first seen with rock and roll." It's interesting t…
It certainly felt that way and it was talked about... but people I knew always listened to a variety of music. The running joke on Youtube about something like Wilson Philips "Hold on" was that "Somewhere out there there's is rocking out to this song".
I don't doubt there were differences among demographics, but I also wonder how much we as humans look for those lines and exaggerate them. I honestly didn't even know who Taylor Swift was for an embarrassingly long time and I yet enjoyed her songs when I heard them. I wonder if for most of the masses it really doesn't matter, but enthusiasts and marketers are the folks who care / notice the differences that might not ever have been THAT stark.