Personally I don't think children should be exposed to AI fullstop, because it absolutely can rot your ability to think and do for yourself, and the temptation is always there to use it - heck look at what's happening with the amount of students using it to cheat in universities.

But at this moment in time there's nothing stopping kids accessing AI tools outside of the school's purview and still have it rot their minds, so perhaps schools should be teaching responsible use - and highlighting that it has no true ability to discern truth from bullshit, so will absolutely hallucinate and lie to you.