That might be biased because your own age puts you into groups of interest to others your own age. I tried to be encompassing with "middle age" because, well, that probably includes me, a 30-something teenager. But that being said, I have felt there's been a slow swing to at least be inclusive of 18-25 year olds. But I also have confirmation bias there because I can't hang with the kids' slang anymore, so it stands out when I see it.

Digression: I'd like to do a study on "what's the funniest number" because it's both age and time dependent. 69 has been funny for a long time, but for boomers and older, was there any other funny number? Gen x and some millennial would likely say 42 (Hitchikers guide to the galaxy). Other millennial might hark back to SpongeBob with 24/25. But what has obviously gotten me curious is 6-7. Of course, my assumptions stem only from my own observations and I could be missing large entries.