What political office besides Senate & Congress and President are they ineligible for? They can buy & insure a car, carry a rifle or shotgun and will go to jail or prison the same as you & I. The things you mention are mostly dictated by corporate policies, not adulthood.
Can’t enter the police academy, take out an IRA, enter contests by Tobacco companies, buy smokes on line, get a Cat B license, rent a stripper, adopt a child, etc etc etc etc.
BTW, is she still sponging off her parents? I think so.