playing a live mtt underage

[smurfitup]

hey all,
i'm 20 and i'm going to be home for 9 days for thanksgiving and another 4 weeks for christmas. i live in la and there are several lucrative mtts i'd like to play while there (up to $500 buyins). the problem is that i'm obviously underage. have any of you had experiences winning an mtt when underage. do they card you if you cash? get your ssn? i have my brother's valid license to use if i do play one of these mtts, but how risky is that? do you guys have any advice? thanks.