To me, the word "vintage" denotes a particularly good year or age of production.......as in a fine vintage wine. Sure, the term is used for any year of production of wine, but with drums, it denotes the quality and appeal of drums made before 1980. Now, this is in my view.
By 1980, American and European made drums had lost that which made them so appealing to me, and I think, to many other collectors.
During the 80's and 90's I sold musical instruments for a retail store while I began collecting old "vintage" Camco, Ludwig, Gretsch, etc. drums. The new stuff we were selling just didn't measure up in my opinion, despite the "improvements" in hardware design, etc of the new drums. Some of them compared their products to the "classic" drums of the 40's-60's while claiming superior design and manufacturing processes.
Asian high-end imports, despite their "slickness" will probably never fall into the vintage category in my mind, even 40 years from now---were I to live that long. I sold oodles of Pearl, Tama and Yamaha kits and drums during this time----even owned a few kits for gigging---but would never now cross the street to consider collecting or owning another of these kits or drums for anything other than a quick flip. There's just something missing; an intrinsic or maybe an imagined ingredient.