how old where you when you first work on a car

I did my first ring and valve (283) at 15.
Reconditioned my first manual trans in 1968/69,(age 16 IIRC)
The first tool I ever bought was a torque-wrench, and I was the only guy in Highschool with one.
Was also the first guy with a slide-rule, and the first with a mechanical pocket-calculator, and the first to take a brief-case to highschool.
but the last to take a girlfriend, which never lasted long; those French Catholic Girls wanted more than I was willing to give.