FWIW, I am not a boomer and on the younger side of the Gen X cohort.
Iraq and Afghanistan were my wars, if that you age me. I think I might have been a fetus when my dad was in Vietnam, but would have to check a calendar.
I think it a factor of time and money being more available to older people, at least for people seeking "more than mid-Fi" fidelity. And, bluntly, it takes serious bucks to make vinyl sound better than something from Best Buy. Mainly, I think, because mid-fi has gotten darn good. So there is no "Buick" in the lineup. You go from nice Chevrolet that is absolutely fine transportation to Range Rover in the audio market.
Aside from the price barriers for equipment, it's having a dedicated place for listening, preferably apart from young children. I am blessed enough to have a dedicated listening room and money for good equipment. And a youngest child who is 15.
I do think the millennial generation is a bit skipped, for the reasons above.
But my children (older teens) are very much audiophiles, probably due to Covid lockdowns forcing them to have at-home interests.
Eldest who is in college has a nice headphone tube amp and streamer (and Focal Utopias she bought with hard earned money). Her taste in music runs from the 1930s to now, and she readily admits older music (70s and older) tends to be far better. She'd love to have vinyl, but a dorm room is not the place.
Youngest has a nice integrated system and my three year old B&W 701s in her room, along with a very high end Pro-Ject (also a hand-me-down) that is her prized possession. We carefully tuned her room with REW software and minimal baffles. Taught her how and she did it. Currently saving up for a nice VDH Frog cartridge. Her music tends towards modern angsty women singers (Lana Del Rey being the only one I recall and some Chinese/Icelandic singer), typically on vinyl. She stole my Mammas & Pappas collection, vinyl.
Also, FWIW, I doubt I'll ever go to "audiophile" events. I'm of the "this could have been an email" generation when dealing with meetings, in general. And would, by far, rather text than talk on the phone. Not much of a club joiner guy. I'm the guy whose family goes to synagogue on the regular, gives plenty, but only talks with anyone if required to, if that helps. Dreds when the rabbi comes to dinner.