Depends on the state. In general, it's illegal for anyone to operate a weapon until the age of 18 (with exception if you are 13 and supervised) but most jurisdictions place the blame on the parents, and they would get in trouble. Notable though, having access to something is often argued in court about "access" means.

There was one case of a court ruling that a parent was neglectful for allowing access to a gun, but the gun was unloaded and locked in a safe. Since the kid was able to crack the code to the safe, and figured out how to load the gun. Don't remember what state that was. Probably New York or California.

Well there was that time I was driving home from a friend's place, and I actually fell asleep while on the highway.

There was also that time when I was young at a hot springs in a national park and fell into a 30 foot deep spot and quickly had to learn how to swim.

There's also that time when I was tearing apart a computer for salvage and cut open the power supply to get at the copper without any idea how much electricity those things have in them.

Then add in all the times that I've just been clumsy around a steep fall, and I think it's safe to say I know the event that has had me closest to dying, I just don't know which one in particular.