I haven't known any method that works, but back in October 2012 I had an account that was a child account. I basically couldn't accept the terms last year but as of recently there has been another one of these November 2013. I singed in and I accepted them with no problem. All I would do if I was you is simply wait. The account will eventually turn into an adult account within less than a year. But, I wish you luck finding a method my friend.