Thanks for at least responding to this.
In my eyes, the average person that age is lacking the cognitive and emotional maturity to be put in such a situation with such a weapon. The brain isn't even fully developed at that age. I've said the same about people younger who have their driving license and they are on a major highway in Canada during rush hour.
As an aside, is the law only limited to firearms, or can he carry a knife etc on his persons? An honest question.
From a philosophical perspective, I have no problem with someone being educated on such weapons, going to shooting ranges and even handling them at home in defense of his "castle" per se, possibly at an even younger so that they fully appreciate them.
I will respectfully disagree with such a scenario being a legal, normal scenario in a state. As with anything in the U.S and you alluded to, that is their state and it's your country, I'm just trying to understand. I definitely have been converted to agree with your Second Amendment as a practical law and right. It is the nuances between states that are interesting.
Texas is probably my favourite state and the one place I believe will fight hardest for your Constitution. It's open carry as I understand. Though I don't know what age is legal there, I always just assumed adults would be the only ones allowed to carry a weapon in public.
He has an obligation to protect his life if it is endangered, on this issue I agree with a judgement when he had a pistol aimed at him by another. No citizens anywhere should be denied by government law from protecting their life from imminent tragedy.