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Pure fanfic
Itachi is his own sensei
Itachi is his own sensei
So the different in age between shisui and itachi is same as different between naruto and Konohamaru.
That doesn't mean he was his sensei.
Itachi was self-taught at age 7 as mention by the Third Hokage Hurizen and benefited from the teachers at the Academy as stated by the Teacher in Sasuke's flashback. He was also taught by Shisui. And Obito was his mentor once he left the village.
Itachi was trained by Shisui (note all the cues and crows he lifted from Shisui's style) and his father Fugaku Uchiha. Itachi was the elder son of the head of the Uchiha Clan. He would've had to have been trained since he could walk, in order to assume a leadership role. Plus, recall Itachi saw combat at age 4. Hiruzen and likely his own father Fugaku put him in the field early.