You don't have a theory. You have a question that will eventually be worked into a specialized statement that you can test. That would become your hypothesis. I would suggest taking a random sampling from more than just this site if you hope to substantiate your leanings (bias). For the record, there are about fifty or so drummers and musicians I work with through my church. All but a few play vintage gear and most all are still in school.Most every studio I've recorded inhad multiple vintage kits and a huge variety of vintage snares. I assure you, there was no age limitations put on the drummers. I'm your average two thousand year old man.
Note the separation between "drummers and musicians." Do you play guitar? Guitar Dude Man