plural of age identity

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

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

Alternative form of age of extinction

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

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

plural of age spot

(formal, idiomatic) For all time, forever.

(roofing) thermal resistance value established by utilizing artificial conditioning procedures for a prescribed period of time.

plural of age standardized rate