(US, slang, dated) A very long time.

(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.

Alternative letter-case form of Jet Age

(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.

A test that uses aggravated conditions (e.g. heat, humidity etc.) to speed up the normal ageing process of an item to see the long-term effects on it within a shorter period of time.

(rail transport) The time when trains were powered by steam locomotives. / A period of industrialisation when steam power was used.

(historical) A period in the 1920s and 1930s in which jazz music and dance styles rapidly gained nationwide popularity in the United States.

Mental reversion to a younger age, used in therapy, as a coping mechanism, or as a manifestation of a psychiatric issue.

plural of age regressor