Charged off old credit card. Validate

I have an old credit card that was charged off back in 1994, with my credit score in the low 800's now, I received a letter from Portfolio Recovery trying to collect. I sent certified mail asking them for VALIDATION as you recommended...? and they sent me a letter showing my current address. Then this past Friday they sent me a letter saying they were going to continue to pursue with collection. Would you recommend I pay it off or...?
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that is too old
i would try to avoid that in a big waylegally i do not think they can collect
to give only your address is not validating the collection
i would use the validation follow up letter
then call the state attorney general