I was about 6 when I started driving the Cockshutt, which we always called a FIAT (I was 5 when we got it - our first tractor replacing 6 horses). Had to stand on the clutch with both feet to get her stopped - not sure what I would have done if I'd have needed the brakes!
IIRC, my first time on the tractor was pulling the potato digger. My dad rotated taking us kids out of school to help him. He sat on the digger to run it & keep the tops from plugging it up. The drills more of less guided the tractor, except at the end of the field.
Loved that old beast - me & my 3 brothers put that thing throught the ringer over the years. One of my brothers said he saw it last year - still going strong but mainly used in the winter for snow clearing.