Crossword Genius

A line in gold showing age (4,3)

Ross

I believe the answer is:

grow old

'age' is the definition.
(synonyms)

'a line in gold' is the wordplay.
'a line' becomes 'row' (a row or line of things).
'in' means one lot of letters goes inside another.
'row' going inside 'gold' is 'GROW OLD'.

'showing' is the link.

(Another definition for grow old that I've seen is " Become senescent".)

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