ok first of all.....i dont think you're catching the point i was trying to prove that oro had no intention of taking itachi's sharingan
the only reference to having anything to do with itachi's abilities was when kabuto said "if itachi couldve helped in the war on konoha, things wouldve been different"
well even if he didn't want itachi's sharingan, he still wanted itachi to be with him.

Therefore sasuke would be 13-14 and so itachi would be 18-20. Then maybe the conversation between the akatsuki took place several months after the fight, and so itachi couldve been 19-21 when they said "7 years ago"
Sasuke = 13-14, Itachi = 18-19

the conversation did take place a few months after. i think as sakura and that were training and stuff before it.
Akatsuki conversation, itachi = 19-20

still doesn't change anything.

he still killed the clan at 11-12, and became an anbu captain at 13

then there's always little details that might not be exactly accurate but shouldnt have to be
like maybe when sasuke said "im the same age when he graduated," sasuke meant "i am half a year younger than he was when he graduated," but it wouldve been lame to be so specific.
And when the akatsuki said "7 years ago," maybe it was more like "6.65 years ago"
How can you say that?

sasuke meant what he said, meaning "im the same age as when he graduated" meaning he is 7
he is still 7 years old, otherwise he would have said his real age. 6, 5, 8, whatever, but it is 7.

it says 7 years ago, we have to take that as 7, otherwise it would be 6, 8, what ever years ago.