The specifications for obtaining a marriage license vary between states. In general, however, both parties must appear in person at the time the license is obtained; be of marriageable age (i.e., over 18 years; lower in some states with the consent of a parent); present proper identification (typically a driver's license, state ID card, birth certificate or passport; more documentation may be required for those born outside of the United States); and neither must be married to anyone else (proof of spouse's death or divorce may be required for someone who had been previously married in some states).