It's interesting to read different perspectives on musical decades and genres that fuel this hobby. I'm not sure if this focus takes away from appreciating what's currently being released, though. There's a vast world of subgenres, starving artists, and non-mainstream music out there that often goes undiscovered by the masses. Fortunately, streaming services with their vast catalogs and algorithms help bridge the gap, IMO.
As for the data, it seems like a meta-analysis would be useful. A few years ago the average age of members on this forum was 61. A poll on reddit's r/audiophile showed that 354 members were under 40, while 254 were over 50. Another poll from the same subreddit reveled that out of 516 participants, a strong majority were also members of ASR, while few belonged to Audiogon or other forums.
What does this all mean? I'm not entirely sure since these samples are fairly compartmentalized. But it's interesting to note that companies like Schiit are offering products like the Yggdrasil "Less is More" and the Yggdrasil "More is Better" (measures better) to appeal to different customer preferences.
I don't think the younger generation of this hobby is as robust as previous ones, but they're out there - often in forums like Head-Fi (presuming), ASR, and reddit. It'll be interesting to see where they take the hobby. At 43, I just hope I'm not left with sterile-sounding options and $1,000 EL34 matched tube sets.