I’ve always thought about this, in the manga, it says it’s been 11 years since Orochimaru left the Akastuki, because of the failed attempt to take Itachi, Itachi made Orochimaru leave. This was discussed when the Akastuki met up, Itachi was allegedly “21” at this time.
But Itachi said to have become the anbu captain at 13, it was mentioned by Kakashi im pretty sure when Itachi and Kisame came to capture Naruto.
Therefor Itachi was around late 13 or early 14 when the massacre was committed, he left Konoha after to join the Akastuki as a spy.
So 13/14 + the 11 years that was confirmed Itachi was in the organization for, that’s 24/25 years.
Is Itachi actually 24/25 years old and not 21 as “official sources” claim?
That would make him around 19/20 when he first came to “capture Naruto” and die around 24/25
I feel changing the “11 years” would be much more complicated than changing Itachis age, Sasuke was 6/7 around the time the clan died, so fast forward, he’s 17 when Itachi is “21”…how did Sasuke age around 11 years and Itachi only 7?
Idk if you already thought of this but it’s just a curiosity I’ve always had, correct me if I’m wrong at all
Glad you asked! Piecing timelines together is a thing I need for closure LOL so I already did it for the brothers!
I don't remember where, but it was said (not by an official source) that the "10 years since Orochimaru left Akatsuki" statement was a continuity error and should be disregarded. Because I could be wrong, but I vaguely remember that this statement was (also) made in the anime when Itachi was only 17/18 (after the chunin exams) and it would make absolutely 0 sense.
As for the massacre, the anime and manga make him 13 at the time. His official age of promotion was only mentioned that one time by Kakashi.
I don't know if you consider the Itachi Shinden novels canon, but personally I like to do so because they don't contradict any manga events, other than where Itachi's hands were when Shisui died... and add a lot of logical context. If we go by the novels, Kakashi only said Itachi was 13 because Hiruzen and Danzo aged him up on paper so as to not stir the pot too much by promoting someone at an age where others barely finish the academy. Itachi was actually 12 at the time of the massacre. It wouldn't be "wrong" for any character to say he was 13 as everyone was fed (and thoughtlessly believed??) the same lies about that poor kid.
In his first detailed flashback in part 1 of the anime (on his way to the inn), Sasuke remembers how he was the same age Itachi was when he graduated, after auntie Uruchi (the chubby lady) said he was 7. That was the day of the massacre. It would also make the most sense. Canonically and in the anime, Itachi is 5 years older than Sasuke, and 7 + 5 = 12.
In Itachi's first anime appearance, Sasuke just had his 13th birthday and Itachi should just have turned 18 the month before. This would make sense, too, as Sasuke is 16 when Itachi dies at 21 (Itachi's birthday is in June, Sasuke's in July).
Itachi's physical development isn't portrayed proportionately to his age or even true-to-data, which adds to the confusion. From the very beginning, Sasuke's flashbacks of 11-12-year-old Itachi show him much bigger than the Rookie 9. And he gets MUCH bigger within just 1 year. 11: 148 cm. 12 (officially 13 thanks to Danzo: 175 cm. LOL did Fugaku put something in his food to make him bigger faster because he also suddenly looks much more masculine??
But then, you put ANY adult in the room with him, and he suddenly shrinks. Danzo is officially shorter at 170 cm, but always shown taller, while Itachi wears thicker soles (Danzo wears slippers mostly).
Danzo has to bend to make eye contact with the squirt:
This is more than 6 cm difference! (175 & 181)
This was around the time of the massacre judging by Sasuke's size. Ummm... Wasn't Itachi officially as tall as Fugaku (175) here...
And this is just before the massacre, after Itachi got tired of trying:
He was supposed to be 6 cm taller than Kurenai (169 cm vs 175 cm), but he's drawn shorter than her!
And to make it all extra sad, I looked up what Itachi would look like in an accurate live action adaptation of the massacre, because Kishimoto draws him looking way older so the "groomed and exploited child soldier" part is more palatable:
For comparison, 12-year-old Itachi in the anime (average for Japanese boys that age is 153 cm, by the way, not 175 which is above average for ADULTS):
Naruto was said to be depicted as smol and scrawny on purpose, but while anime styles usually make a character look younger than their real life counterpart, Naruto was probably closest to that?
Thanks for coming to my Ted Talk!