Gets older and agrees about being dropped (4)

I believe the answer is:

ages

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'gets older' is the definition.
('age' can be a synonym of 'get older')

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for ages that I've seen before include "Awfully long time" , "Indefinitely long time" , "Rock of - - (hymn)" , "Gets older" , "A long time (colloq.)" .)

I've seen this clue in The Telegraph.

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