Grows up

I think it could be either:

Which length description are you looking for?:

ages

'grows up' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for ages that I've seen before include "Times" , "A long time (colloq.)" , "Matures" , "Rock of - - (hymn)" , "Sage (anag)" .)

I've seen this clue in The Mirror.

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