Non-age: Both parties must be over the age of 18 years, unless a party is between 16 and 18 years old and has parental consent to marry; or is under 16 years and has both parental consent and court approval to marry. No person under the age of 14 years may marry under any circumstances. A marriage between persons under the age of 18 may be annulled, at the discretion of the court, if the spouse under 18 wants an annulment, or an action may be maintained not only by the underage spouse, but also by either his or her parent or guardian.
5 years of incurable insanity: If during the marriage, either party becomes incurably insane for five years or more, the marriage can be annulled. However, the sane spouse may be required to support the insane spouse for life.
Mental Incapacity: A marriage may be annulled if one or both of the parties suffered from mental illness or retardation at the time the marriage was entered into. This ground is waived if the moving party remains in the marriage after his or her incapacity is cured.
Duress: The parties must knowingly consent to the marriage. It may be voided if either spouse consents to marry as a result of the force or duress of the other spouse; or if either spouse cannot understand the commitment they are about to make. This is also known as lack of consent. However, subsequent cohabitation, or evidence of forgiveness on the part of the coerced spouse, may disable his or her ability to plead under this ground.
Already married: If a spouse gets married before his or her previous marriage was legally dissolved or annulled, then the present marriage will be void.