I agree with that.
I will research "Prior Restraint" but I would think the Founders meant that you must be of, at least, "militia" age. I would also think that being neither crazy nor criminal could be assumed.
Sure. But understand and make a distinction between a SOCIAL web of restraint and a LEGAL/POLITICAL web of restraint.
Understand further that some of the most proficient adults both then and now were given adult sized responsibilites at ages as young as 10 or 12.
It is a great curiosity that people who see nothing wrong with teaching their kids to skate at speeds of 30-40 miles an hour as young as the age of 5 so they can practice as early as 6 AM to compete in the Olympics consider necessary survival training in use of firearms and weapons too dangerous until children are at least 18.
Some of our best shooters-1996 Olympic Medalist Kim Rhode- started shooting AT the age of 5. ( Shhhh. Don't tell the liberals!)
Never give Government an inch at any time for any reason. They will always take a mile or more.