I'm not sure this is true. And I suspect Baby Boomers felt the same way in the 1990s, sure that everyone still cared about the Rolling Stones, Easy Rider and so on. Certainly, we had all of those 30 year old properties shoved down our throats by Madison Avenue.
But that didn't mean there wasn't plenty of youth culture happening. I remember my dad asking me if Kurt Cobain was "my John Lennon" when he died, since that was his lens for viewing pop culture.
The Gen X folks who make up, as I recall, the bulk of ENWorld posters aren't terribly likely to know what the youths are doing, because that's the whole point of youth culture. And nowadays, it's not on message boards or Facebook, where their parents and grandparents are, but in text threads and Discord, where the olds can't stick their noses in.