When was that?
I remember trying to buy primers for my dad in 7th or 8th grade, mid-60s and couldn't; too young.
That was back in the early 70s in Michigan. I never had to produce an ID of any kind to buy powder, primers or bullets.
I also bought several black powder pistol kits because I could and thus I owned handguns. Granted, they were muzzle loaders but I still had them. They were really fun to make too.
Also purchased several muzzle loading long guns. No ID required, at least where I lived.