Advanced in years (4)

I think it could be either:

Which length description are you looking for?:

elderly

'advanced in years' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for elderly that I've seen before include "Fairly old, past middle age" , "Rather old" , "Silver" , "Getting on in years" , "over the hill" .)

I've seen this clue in The Independent and The Irish Times.

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