When you reply to your own post, is that the same as "talking to yourself"? Does this constitute my being crazy? Or was that already a forgone conclusion?
Anyway....
I asked this question with my opinion already formed. I don't believe there is a set year or date when "vintage" stopped and the modern era began. It's been a gradual transition, faster with some brands, slower with others.
From all I can remember, the change began about 1960. By the late '60's, most everyone had built a few models with modern features, but these were transitional tractors. They stayed that way until the early 1980's when electronics/plastic/high tech started to take hold.
I see ANY tractor before 1960 as vintage. A select group produced from '60 to 1980 as being included. Anyhing after 1980, well, I DON'T see them as ever becoming vintage. (Not commenting on that being good or bad)