["It's not mandatory once you turn ten"

It's clear by Izuku's expression alone that he 1) can't comprehend that being a thing and 2) doesn't think it's right

But this is Pokemon world so there's not much he can do about that...for now.]

I see...I hope that hasn't deterred you from learning entirely, at least. There's still a lot about this world to discover I think, even if you're not getting an official education for it.