The unified marriage law in the United States is 18 years old, but the States in the United States are different. Some states stipulate that men are 2 1 year old. Some states stipulate that parents' consent is required before marriage if both parties are under the age of majority. Some states stipulate that men 18 years old and women 16 years old can't get married even if their parents agree. Idaho, Mississippi, New Jersey and Washington state allow boys over 14 to marry girls over 12.

Most States in the United States stipulate that marriage registration in the United States should be over 18 years old, regardless of gender. 16 years old or below 18 years old, the consent of parents or local judges shall be obtained.

However, the marriage certificate is valid for 30 to 60 days in each continent, otherwise the marriage must be re-registered.