the age at which a person is considered competent to manage their own affairs

Eighteen (18) years of age. See CPLR Section 1206.

The age at which an individual becomes old enough to make a contract, generally 18 to 21 in most states.

The age at which a minor becomes an adult. This age varies according to each jurisdiction.

Set by statute, the age at which a person ceases to be a minor and is able to contract on his own behalf.

The official standard of maturity upon which one is held legally responsible for one's acts. Contracts for the sale or lease of real estate by a minor are voidable by the minor.

The concept of legal age is a limitation set by law that specifies that only people that have reached a certain age are allowed to participate in some activity. These ages differ from jurisdiction to jurisdiction, and sometimes have special exceptions.