Hi lincemiope. The English language is strange. Most of the entries have taken the meaning of the word "vintage" to be something classic, or just plain old, but the primary meaning of the word is actually all about wine. I know that English is not your first language, so here is the definition:
1.the wine from a particular harvest or crop.
2.the annual produce of the grape harvest, especially with reference to the wine obtained.
3.an exceptionally fine wine from the crop of a good year.
4.the time of gathering grapes, or of winemaking.
5.the act or process of producing wine; winemaking.
6.the class of a dated object with reference to era of production or use: a hat of last year's vintage.

You are not the first one who has thought that the #6 definition was the only correct one.