The 7-year reporting period is based on the date of first delinquency. That is the date the account went into default and was never brought back to a current status. Charge off will follow. See 15 U.S. Code § 1681c(c).
(c)Running of reporting period
(1)In general
The 7-year period referred to in paragraphs (4) and (6) of subsection (a) shall begin, with respect to any delinquent account that is placed for collection (internally or by referral to a third party, whichever is earlier), charged to profit and loss, or subjected to any similar action, upon the expiration of the 180-day period beginning on the date of the commencement of the delinquency which immediately preceded the collection activity, charge to profit and loss, or similar action.
