of, or relating to middle age; neither old nor young

The chronological age of individuals of the same maturity as the person in question.

(idiomatic) To reach a specific age where one is legally considered to be an adult. / (idiomatic) To mature, or become fully developed.

The period from the about the time of the launch of Sputnik in 1957 to the present day, during which people ventured into space. / (attributive) Redolent of the space age; appearing futuristic or modern.

(idiomatic) A time period of years or more.

Being of an age during which attendance at school is customary.

Synonym of prehistory: the era before written records.

(idiomatic, Ireland) The same age as; (followed by a name).

Eldercare.

(Roman Catholicism) Synonym of age of reason