I don't know how the term 'vintage' came to mean 'old'. That word simply describes some specific period of time, originally applied to wine.
About like saying 'back in the day'. huh? When was that?
Merriam-Webster:
Main Entry: vin·tage
Pronunciation: \vin-tij\
Function: noun
Etymology: Middle English, probably alteration of vendage, from Anglo-French vendage, vendenge, from Latin vindemia grape-gathering, vintage, from vinum wine, grapes + demere to take off, from de- + emere to take — more at wine, redeem
Date: 15th century
1 a (1): a season's yield of grapes or wine from a vineyard (2): wine; especially : a usually superior wine all or most of which comes from a single year b: a collection of contemporaneous and similar persons or things : crop
2: the act or time of harvesting grapes or making wine
3 a: a period of origin or manufacture b: length of existence : age
But yes, I have used lots of old speakers. They did not sound as good as newer designs.
Steve