Getting on a bit? (7)

I think it could be either:

Which length description are you looking for?:

elderly

'getting on a bit?' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for elderly that I've seen before include "Silver" , "Past middle age, a senior citizen" , "... or not of tender years" , "Fairly old, past middle age" , "Not young" .)

I've seen this clue in The Guardian.

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