How do you determine when an LP is worn ?

As per title,played a Steve Hacket LP the other night,this would have been played to death back in the 70's with many different cartridges including Decca's.First track has a couple of Acoustic guitars playing,I could usually locate where they were in the mix,but it sounded all jumbled up with little separation.Another track had a guitar which started in the background and gradually built up to a cresendo,it's more of a whimper now.I have wet cleaned disc to no avail.

This is a first for me,I have plenty of slightly scratched but still playable discs,but apart from the obvious noise,they sound fine.

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