Good question. Where do we dray the line, assuming a line is necessary. I know a lot of vintage guys don't like anything after the '70's. Does that make '80's gear modern?
I consider my '80s Accuphase vintage, but its right around my own personal cutoff. Not sure I'd call my mid '80s Sansui Au-x901 vintage, even though it is only a few years newer than the Accuphase. It just doesn't look, well, "vintage". But I don't consider anything from the '80s or up into the mid '90s "modern". It's just "good gear", well, at least when it actually is good gear.