Man, that is going to be the defining moment. A world without electricity is hard to imagine for me. But honestly before "smart phone" or even before "PC" isn't that unimaginable.

Like sure things will be a bit different but the fundamentals of life aren't.

But I can imagine for someone growing up with AI a time before AI (BAI not BCE... Lol) would be unimaginable. Like:

You had to do all the thinking yourself? You relied on other people who thought for themselves? You had people doing manual labor??

And of course things we can't even imagine now.