Originally Posted by Jack Daw

Dunno if it's an effect only in my area, but generally, older tractors were constructed for much longer material endurance and I've seen some that have been working (almost) since 1960.
Many new tractors can't compare to the old ones. Also repairing a newer tractor (the bigger the worse it gets) can be tricky and is not as simple as repairing older, yet elegantly simpler models.