I guess I consider any garden tractor made before 2000 or so to be vintage at this point.
These tractors were built to have a 10 year life span at most, so that makes an 00 almost twice that span.
Truthfully there are only a few generations of these critters. 60's monsters with full frames, small motors and lots of weight. 70's where they got more useful, but also lost some of their charm. 80's to mid 90's where I feel the best true garden tractors are.
Most of these still have full frames, but some had morphed into c channel or one piece frames. The good news is that even those still were made with 10 or 11 gauge steel and most of them came with either a stout hydrostat auto trans, or the Hi/Lo 6 speed that is tough as nail.
These 80's units can be found dirt cheap and if they come with a sleeve hitch on the back they can do just about everything a small farmer needs to do, short of back-ho work.
The better news is that you can still buy attachments for these things new, even though they are not built as well as the oldies.
My 1994 Craftsman II GT6000 has the Hi/Lo trans, Ag tires filled with fluid for extra traction, a sleeve hitch for the cultivator it came with, and that cool little scoop.
The scoop is good up to about 250lbs per scoop, so its quite useful on my little homestead.
Heck even a 2000's garden tractor is still cool, but I feel they are still overpriced, and tend to suffer more trans issues.
I know the 120V generator add on was available on the 80's model craftsmans. but I think they discontinued it when they went to vertical shaft engines in the mid 90's.