Why are 20 year olds allowed to be officers?
Why are 18 year olds allowed to manage multi-million dollar weapon systems in Irag and Afghanistan?
I think it’s more about the selection process and training than the age.
Despite alot of criticism of modern teens, I have worked with some very capable young adults. By the same token I have also seen some real dunderheads.
I have also encountered a whole bunch of emotionally stunted 50 year olds. Age is only one part of the equation.