How about instead the parents decide? I can let me kid use the computer for as long or as little as I want. Cars have no age verification. Simply driving as a minor is not allowed. I get to train my kid to drive or go to driving school. Thus a computer simply needs me to be root and for I to establish my own control and destructions. If the law says you can't be on the internet as a minor, then fine I can restrict the internet access. Otherwise a computer is just a fancy calculator.