(mythology) One of the five ages of man, the period at which semidivine and human heroes are purported to have lived, between the arrival of the Greeks to Thessaly and the Greek return from Troy.

Synonym of modern period or modern history (the period following postclassical history, in Europe known as the "Middle Ages", spanning from about 1500 to the present).

(anthropology) An established social category or group consisting of people born during a certain time span who together move through a series of culturally defined age grades.

(anthropology) An organized, culturally defined social category of people with membership based on age; in some societies it is entered automatically when one reaches a certain age, while in others it is entered through an initiation rite and/or the payment of a fee.

(demography) The age that divides a population (of a country etc.) into two numerically equivalent groups.

plural of age identity

(psychology) The age category such as "child", "young adult", "old person", etc. that is part of a person's self-identity.

(archaeology, paleontology, geology, geochronology) The age of a material as determined by radiometric dating.

present participle of age out

present participle of age out