plural of radiometric age

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

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

plural of age identity

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

A pension paid to people by the state, when they reach a predefined age, to compensate for loss of earnings

To behave in a manner appropriate to one's age. / (imperative, originally US) To behave in a mature manner; to avoid being childish.

(music) A genre of music of a mystical and meditative nature, associated with New Age philosophies, usually in the style of world music and using the sounds of nature.

(Britain) A member of a community of people, many of whom hold New Age beliefs, who travel among fairs and music festivals.

(medicine) The incidence rate of a particular disease in a population if that population had a standard age structure.