On the Halo 4 Global Championship -Yoink!- Gaming website, I try to register and put in my birth date, June 7, 1989, but the site says I am not of age. I’m frickin’ 24 years old. Either this is a glitch or the championship is for old people.
Very similar thread here:
The linked post likely has the reason why you’re not being registered into the tournament.
If there is something else wrong, please post in that thread.