The old fogeys are stony! (7)

I believe the answer is:

fossils

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

'the old fogeys' is the definition.
'fossils' can be an answer for 'fogeys' ('fossil' can be a synonym of 'fogey'). I am unsure of the 'the old' bit.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for fossils that I've seen before include "Prehistoric remains" , "Petrified remains" , "Skeletal remains" , "Old bones" .)

I've seen this clue in the Evening Standard.

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