(idiomatic) In a manner that produces long-lasting effects; for posterity; for a very long duration.

(Ireland, informal) for a long time

plural of aging

number of years a person has lived (also of things)

present participle of age out

A test that uses aggravated conditions (e.g. heat, humidity etc.) to speed up the normal ageing process of an item to see the long-term effects on it within a shorter period of time.

(formal, idiomatic) For all time, forever.

present participle of age like milk

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

(education) An age at which a child is required to attend school.