And how many acres are you farming on it? Today's world of agriculture is much higher tech-based (for many good reasons, primarily yield) than back in the horse and buggy days of farming.

5.75; 7.5; and 42.6.

I know of a forklift that's pushing 80 and still used in a lumber yard (i.e. a material handling centric workplace)

Other than ~30min it takes to teach an employee to drive manual it doesn't do anything worse than the modern ones it works alongside and it does a handful of minor things much better by virtue of predating OSHA.