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Make sure the balance on both FP cards is zero - then close them botth. FP can be very helpful when repairing.. With a 698 you're done repairing..
It will not hurt your age - they will continue to stay on your file for 7 years, I believe.
AAoA (Average Age of Accounts) calculates all accounts, open and closed.
I would not close an account that has a balance reporting as this will affect your utilization. Pay the cards off first. Read the sticky about closing accounts before doing anything. You have moved on to better credit cards...
I don't know what you mean about 7 years haunting time. 7 years - bad accounts stay on your record from the date of first deliquency (DOFD) that you never ever got current again. Take a charge off, for example, the DOFD would be the very first month you never got current, add 7 to 7.5 years that's when the account would fall off.
Paid positive status accounts remain for 10 years.
I hope this helps.