I learned to drive when I was 10. I helped out on the family ranch. My first rig that day was the 1944 Willys MB. Basically a CJ-2, it had/has a three speed on the floor & a 2 speed transfer case.
The next was a 1952 Dodge Power Wagon, a 2.5 ton truck with a 5 speed manual transmission, 2 speed transfer case, & a 2 speed rear axle. One needs to remember not to use the high rear axle range in 6 wheel drive. You can break things that way.
While I do not remember learning on the Peterbuilt Semi tractor until the next season, the rest of my family tells me that I drove it that first day. It was made in 1948 it had a 150 horsepower Cummins engine with a 5 speed main box, a 4 speed Brownie, (or auxiliary), transmission, & 2 speed rear axles. It had 40 gears forward & 8 in reverse. None of the gear boxes had syncros. They were/are all straight tooth gears. One has to double clutch to drive this rig.
I got my farm permit at 14, whitch allowed me to legally drive on public roads. I mostly drove the Dodge or the Pete.
No one liked driving the Power Wagon as it had/has Armstrong power steering. I am a fair sized fellow & my arms are bigger than most folks legs. Thus, my bigger cousins & I got to drive the Dodge.
I got to drive the Pete as I was one of 3 out of 13 drivers that drove it well. I rarely ground any of the gears & I was very good at moving both the shift levers at the same time while steering & operating the rear axle gear selector. If you added anything else, I was done.
In the off season, I drove the Willys. It is amazing how much “Farm business” a 14 year old kid can find for one of these 1/4 ton farm trucks. Most of this business was down at the beach! We also had a bunch of VWs that I wrenched on & drove.
I voted that I can drive a car with a manual transmission. I believe that I am a fair hand at it.
OH, & for the record, my girl cousin, who is 2 weeks younger than I, learned to drive these rigs on the same day, at the same time. We traded off who went first. On this note, all of my sisters learned on manual transmissions, all 8 of them.