plural of age group

Synonym of prehistory: the era before written records.

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

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

the period of life between youth and old age; midlife

(historical) A historical period of great accomplishment in a field or a society, usually following, and not quite as favorable as, a golden age, and not unfavorable as an iron age.

Belonging in the Stone Age.

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

A therapy or process which reverses the physiological aging process.

(mythology) The most recent and debased of the four or five classical Ages of Man; hence, any period characterized by wicked behavior. / An age characterized by the use of iron.