Crossword Genius

Pretty dated, like comedians Benny and Harry? (2,3,2,3,5)

Ross

I believe the answer is:

as old as the hills

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

'pretty dated' is the definition.
'as old as the hills' can be an answer for 'dated' (I've seen this in another clue). I am unsure of the 'pretty' bit.

'like comedians benny and harry?' is the wordplay.
I cannot quite see how this works, but
'like' could be 'as' and 'as' is found in the answer.
The remaining letters 'oldasthehills' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Independent.
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