It was suggested here:Lmfao Kishi and his cluster**** and inability to tie timelines together, man is not paying attention to his own manga.
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Yet Part 1 suggests Itachi was at least 13 yr old when he defeated Orochimaru yet Databook 4 states that Orochimaru fled the Akatsuki "7 years ago" (in respect to the War Arc) which made Itachi 15 years old.