Cars:
15
i snuck out of the house at 2-3 am and drove around a couple of times , almost fell asleep and crashed
also when 15 (before DL) , i drove my dad's company pickup on a saturday while he was out of town, that one was pretty stupid
other:
tractor, about 8 years old, when you grow up on a farm , that is normal (at least until you hit the barn

)