(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

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).

The current period of Earth history characterised by large-scale extinction of lifeforms as a result of human activity.

Alternative form of age of extinction

(intransitive) To get older; to advance in age / (transitive) To cause to become older; to imagine to be older (especially of a fictional character)

(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.

(historical, aviation) A period in history defined by the advent of aircraft powered by turbine engines, and by the social change this brought about.