Over 50, good-looker, but getting on a bit (6)

I believe the answer is:

oldish

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'getting on a bit' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?

'over 50 good-looker' is the wordplay.
'over' becomes 'o' (cricket abbreviation).
'50' becomes 'l' (Roman numeral).
'good looker' becomes 'dish' (I've seen this in other clues).
'o'+'l'+'dish'='OLDISH'

'but' acts as a link.

Can you help me to learn more?

(Other definitions for oldish that I've seen before include "Getting on in years, but not too bad" , "Fairly ancient" .)

I've seen this clue in The Times.

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