What are the formalities of a marriage?

Divorce

Yes. If a person is already married in the United States any subsequent marriage would be null and void legally unless the prior marriage had been terminated by a court decree. However, it would also...

When two people are not married in a church or the Justice of the Peace they are living 'common law.'

In most states you need to be 18 or older, but in some states you can marry anytime you want with written permission from a parent or legal guardian from both sides.

mar·riage n. 1. A. The legal union of a man and woman as husband and wife. B. The state of being married; wedlock. C. A common-law marriage. D. A union between two persons having the customary but...