Focusing on kids, because that's where I've got the clearest reference for making my own comparisons: 30 years ago, kids in my neighborhood spent most their time running around outdoors. I'm not even sure everyone's parents knew where they were half the time, and it was fine as long as you made it home for dinner. Nowadays, kids seem to spend most their time playing Minecraft or Fortnite or whatever. I don't see them often on the sidewalk unless they're headed to or from school, and the playgrounds are generally pretty quiet. Over the same time period, hours of TV watched per household is up by about 2 hours per day, and consumption of the Internet has gone from zero to whatever it is right now, so that's where I'm guessing all the kids have gone.