Grow older (3,2)

I think it could be either:

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3,2

get on

'grow older' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for get on that I've seen before include "Advance; prosper" , "Make progress; be friends" , "Enjoy harmonious relationship" , "Proceed; prosper" , "Board (a bus)" .)

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