Well past one's prime yet still making progress (7,2)

I believe the answer is:

getting on

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'making progress' is the definition.
('get on' can be a synonym of 'make progress')

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for getting on that I've seen before include "Like group of friends" , "as a boarder > in later years?" , "no longer young" , "Elderly; succeeding" , "Enjoying friendly relations" .)

I've seen this clue in The Globe and Mail.

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