I hope you are being sarcastic. I started hunting at the age of 12, which is still commonplace in many states.
Also, there are going to be a lot of Army and Marine privates that won't be about to do their jobs for their first 3 years of enlistment.
Kids, on pharmaceuticals and raging hormones and internet brainwashing and peer pressure and stress of studies and illegal drugs/alcohol.....aren't old enough to be rational, aren't old enough to be trusted. Even voting and drinking should be 21.
Sorry, argue all you want.