To a young collector I suppose cards from the late 70's and on are considered vintage. But to the more advanced collectors we know that vintage means cards before the 80's. And its funny to hear a collector refer to their vintage collection when you know the oldest card they have is a 1982 Cal Ripken Topps.
I don't mean to rain down despair on the young collectors but vintage is usually older than that. When a collector starts speaking in codes like t206, Sweet Caporal or Goudey then you know you've hit the advanced mark. I do welcome young collectors to collect vintage as well as modern cards. Vintage cards teach us the history of baseball and usually has an older generation feel, if that sounds right.