My opinion, that don't make it right, it's just how I look at it. Early tractors replaced the horse, some people still used horses into the late 40's or early 50's. All the tractor had to do was more work than a team or 2 of horses and it was a big improvement. Operator comfort and convience wasn't considered. After WW2, hydraulics made a drastic improvements to the tractors usefullness. Implements could be raised and lowered with hydraulics instead of a hand lever or trip rope. In early days, operator comfort and ease of use was kind of looked down on, if you aren't doing it the hard way, you are doing it wrong! Tractor improvements made it possible for 1 man to farm more acres, so manufacturers started adding conviences to tractors, live pto, most all of them had some kind of rear lift for implements; 3pt hitch, fast hitch, snap coupler, eagle hitch, etc that made the work faster and easier. Along came the late 50's, early 60's and everyone had power steering and 3pt hitch, most had dual hydraulics, most had some sort of 2 speed affair on them, torque amplifier, ampli torque, multi power, hydra power, etc. Most all of this vintage tractor were easy to operate and could do a fair days work. On to the 70's and 80's, tractors got bigger and the necessities of the tractors from the 60's and 70's were improved on but still basically the same units. The tractors of today are light years ahead of the old technology, GPS, guidance systems and more stuff that I don't have a clue how to use have made it to the point that about all you can do is add oil and change it when the computer tells you to. So, back to the original question, when is a tractor old? I guess that is up to the individual. My 1850's are old, but to me they are still functional, my 88 and Farmall 400 are old tractors with limited use, but still good to have around. To someone else, the 4020's, 856's, 190XT's etc and simple chore tractors or only used for augers while they need Bigger, newer tractors with all the bells and whistles to be useful. They say beauty is in the eye of the beholder, the same could be said for the age of a tractor, it's up to the guy that owns it. Chris