Every state has its own details as to marriage law differences, even amid general similarity in such laws nationwide. Thus, in marriages and in divorces it can be important to have the legal advice and representation of an experienced family law lawyer.
In California, eligibility requirements for marriage include the following: you must be an adult (18 or older) OR have the written approval of at least one parent plus a court order permitting the underaged marriage; all marriages must be by consent of both parties and with both parties being of a sound mind and understanding the nature of the union; and a valid marriage license must be obtained and used within 90 days (or it will expire.)
California now recognized same-sex unions. And California also recognizes marriages legally performed in other U.S. states (as per the U.S. Constitution) and territories, plus most marriages performed in foreign nations.
In many cases, pre-nuptial agreements will be signed before a marriage; and these will be an important reference point should the marriage unfortunately end in divorce at a future date.