I wasn’t intending hostility. It’s logical. If it’s responsibility for actions, that usually starts around the age of 5 in public schooling in the USA, especially criminal culpability.
I’m not saying that 5 is the right answer. I just find it interesting how certain responsibilities are expected and others are not.
US loves their JROTC program, which in some areas starts in middle school (11/12/13) so the training starts super early but I agree with you about over 20 for that, but I think the armed forces counts on the naivete of new recruits. But I wish they didn’t.