Grow old (3,2)

I think it could be either:

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3,2

get on

'grow old' is the definition.
(thesaurus)

This is the entire clue.

(Other definitions for get on that I've seen before include "Make progress or mount up" , "Make progress or advance in age" , "Age; prosper" , "Board - prosper" , "Make progress or climb aboard" .)

I've seen this clue in The Guardian and The Independent.

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