Crossword Genius

Four keys are old (4)

Ross

I believe the answer is:

aged

I'm a little stuck... Click here to teach me more about this clue!

This clue could be a double definition.

'four keys' is the first definition.
'aged' can be an answer for 'keys' (A, G, E and D are musical keys). I am unsure of the 'four' bit.

'old' is the second definition.
(similar in meaning)

'are' acts as a link.

Can you help me to learn more?

(Other definitions for aged that I've seen before include "not like a callow youth" , "Got older" , "Like Uncle Arly" , "Old or ancient" , "Geriatric" .)

I've seen this clue in The Mirror.
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