A similar cutoff for me, which would be 1980. I've always disliked 80's music, but thanks to devoted fans here on Medium, I've begun to backtrack and now appreciate "new" music from 1980 onward (obviously there were a few musicians I knew and liked after I drew into my shell circa 1980, but not that many compared to the "old" musicians I continued to like.

Here's one take on the state of fandom in 2022:

Since the beginning of recorded music in the early 20th century, we've had a variety of major genres: popular, folk, classical, country, blues, jazz, international, and the new kids--rock and rap. There had always been some diversity within each category, but around the 50's-60's, each genre began to branch out in various directions.

Country: traditional, countrypolitan, outlaw et al.

Jazz: swing, bebop, cool jazz et al.

You've mentioned a number of rock subgenres.

I think these changes are partly the result of innovations in musical and recording technology, and partly due to the emergence of small labels and alternative radio, which weakened the production and distribution monopoly of the major labels.

So not only do we have more music (more songs) available today than ever before (especially as the old stuff gets reissued and streamed), but we're also confronted with a dizzying variety of TYPES of music. And contemporary musicians often borrow eclectically from various subgenres and periods, creating even more variety, e.g. Swedish lounge metal).

So it's natural to retreat to a relatively secure and manageable past, and select from "new" music only that which fits in with our cocoon playlist.