I see some younger users, but I don’t know about collectors. Businesses like Yoseka in Brooklyn seem to cater to a younger clientele (and I’m using that term loosely - as in under 45 - but 45 seems to be the new 29). It does seem like interest in vintage pens (and especially pre-war) doesn’t seem as hot as it was 30 years ago when I first became interested, but maybe that’s because more of us with larger hands appreciate bigger pens that don’t cause cramping after a couple of hour’s use…!