The future belongs to the children. It is both true, and mostly meaningless trite phrase.

There may be a moment when something happens that only new children get to take advantage of. Some kind of anti-aging process that requires treatment in utero, or retention of cord blood which is something that only wealthy people are able to do at this point. At that point, there may be an infection, where all the people born too early are not able to take advantage of this piece of the future. It’s a common trope in science fiction.

I don’t see how that applies to AI. We will see the usual set of people who can’t adapt to new technology, just like my grandparents could never operate a VCR except to play a movie. We will also see that being a child with something exists does not automatically mean that you understand how to use it properly. It’s just less likely you’ll have mental blocks for TRYING it.

“The steam engine belongs to the children!” Feels similar to me. Different era, different tech, society will thrash around, but you don’t need to be a kid to get it.