At what age can a person sign a legally binding contract? I come across a situation where I had to sign some papers, but I'm not sure if they would actually hold up in court as the other person thinks, as I am a minor. Too my knowledge, a parent or guardian would also have to sign it in order for it to be good. Also, If said contract was contract was signed when I was 17, would it magically become legal when I turn 18?