Okee dokee, all this debate made me look up the word in a dictionary which came up with the following meanings:
vin·tage /ˈvɪntɪdʒ/ Show Spelled [vin-tij] Show IPA noun, adjective, verb, -taged, -tag·ing.
noun
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.
to wines or winemaking.
8. being of a specified vintage: Vintage wines are usually more expensive than nonvintage wines.
9. representing the high quality of a past time: vintage cars; vintage movies.
10. old-fashioned or obsolete: vintage jokes.
Good thing is it majors on wine, a little bit like the missus so maybe she will also become vintage. Also note meaning number 9, which does fit into there being a period in time where the item being referred to is accepted of being of higher quality