Yet, you don't oppose an 18 year old in an M1A3 Abrams, do you?  Or, one who carries an M4, grenades, and other weapons of war, do you?
Your logic is flawed.
Many who take classes at U of A campuses are veterans, older adults, and not just 18 year olds . . . and, at 22 I had 3 kids, a good job, and carried firearms for my country and myself when we hunted and fished.
Your logic is flawed.