The term 'legal age' refers to the age at which a person is considered legally responsible for their actions. Maturity, MAJORITY, and MAJOR are all related terms that can be used to describe this concept. Maturity is the state of being mature, or having reached a certain level of mental and emotional development. MAJORITY is the age at which a person is considered an adult in the eyes of the law. MAJOR is the age at which a person is considered an adult in the eyes of society. All three of these terms are related to the concept of legal age.