I have to admit to being a bit surprised at what makes the cut here as "vintage" on my earlier visits.
Panasonic. Really? Okay.....
That one is still kind of doubtful as vintage with me, which probably says a lot about my age.
I still have much trouble with the idea of a MTB being vintage in any form. See the last line above.
My current favorite ride is an 83' manufacture year, and to me, it just barely makes the cut as vintage. I suspect it was factory built for the express purpose of using up old and arcane french bicycle parts. The r/d on it looks like something out of the early 60's, as does the f/d.

I still get weirded out on discussions involving "patina" which in more rational discourse is a sign of a huge lack of care and up-keep.
The same discussions apply to cars, guns, camera's, fishing reels, etc, etc, so we're not alone- not by any stretch of the imagination.
All of which is just my opinion, which actually means very little in the grand scheme of things.

-D.S.