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IMHO - You will lose " 5 years age" if the account is closed. I would keep it and PIF if you use to avoid interest.
I'd make a small purchase and PIF immediately. Why lose an active, positive TL when you don't have to?
Also, if the account is closed, the only difference it makes is if you apply somewhere and go under a manual review. In that case, closed by consumer may reflect better than closed by grantor, but that decision would probably be made by the new creditor.