If there is a balance on an account (credit card, auto, home) and the lender decides you've had enough time, they'll call it due and usually it's something like 120 days and they'll just close the account and "charge it off" as a loss. IOW, they don't expect to be paid.
I used to work for an auto collections place and had to do charge off's twice. It was SO lame! Both times the person paid the debt within a month, but it was still on their stinking credit! Also the situations surrounding the reasons for being behind were really heartbreaking.
I would think that it would be the DOLA (date of last activity). Their charge-off notation would re-age the account. And then it would be 7 years for negative reporting, 10 years for positive notations.