What did I say, Sajha is not the best place for legal advice. People give advices w/o knowing much on the issue and having no concern about the effects.

The last post states both bride and groom need to be under 18, completely trashing every suggestion given above. Now would you trust that suggestion? I wouldn't. And I wouldn't also trust my suggestion since I am not a legal expert nor a lawyer. Bit if it helps read this and note the word "If either of you is/are under 18," meaning both DON'T need to be under 18:
http://www.usmarriagelaws.com/search/united_states/teen_marriage_laws/