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

plural of prehistoric age

A therapy or process which reverses the physiological aging process.

Used other than figuratively or idiomatically: The least age at which one is permitted by law to drink alcoholic beverages. / (poker slang) A two and an ace as a starting hand in Texas hold 'em

plural of age of majority

(see usage notes) The period of European history encompassing (roughly) 476–1000 CE. / (Ancient Greece) The Greek Dark Ages (c. 1100–750 BCE). / The dark ages of Cambodia (c. 1450–1863).

plural of age group

Alternative letter-case form of Atomic Age

(idiomatic, US, colloquial) A very long time.

(statistics) The number of people in stated age ranges.