Understood.. but what happens when you uphold your end of the bargain after adulthood doesn't change the fact that you entered the bargain at an age not considered legal. That is why I was comparing it to getting a mortgage that your parents pay while you are still a minor but responsibilities transfer as you past 18. Your parents entice you to enter the agreement but as soon as you say yes is taken and considered to be your own will. So therefore, whatever happens at adulthood may happen, but at that very moment you were not old enough.
In that case, what prevents any other contract to be entered as a child. Wether is a marriage, a cell phone contract or an employment contract.... so long as you continue to uphold your deal until you are 18, then you are ok?