I would agree with you. I do lump in edwardian more or less with antique even though the end of the period is not *quite* antique but close enough. for me anyhow.
However, vintage seems to correspond not with an exact cutoff of 20 years...but to a prior and distinctively differing fashion movement. (not academically set in stone, but that is what i have observed by the way it is "marketed and packaged" ) i find that things are "sped up" with the more communication as time goes on. ( newspapers start, then film, etc and have a window to other places... and what other people are wearing.
say there might have been a 50-100 or more year fashion cycle back in medieval times...passing down garments from mother to daughter and being pretty isolated from other places....but now between the time fashion really takes a departure...and how things come back around again is rotating with lightning speed...
Heck, vintage in 10 years might be stuff 5 years old...just kidding... but i was a little freaked out when i discovered that things i wore as a kid/preteen is vintage!!!!! :mad: At least in public perception!