Flash back to the 1950's and you'd know exactly what it is like. No moon missions and no world communications via satellites eh?
No need to go so far. I was born in 1980 and there was no Internet in my childhood/teenage years (well, it existed, but virtually nobody had access). We socialized a lot more than todays children/teens, when we wanted to meet someone we would just show up at their place or call the landline and ask their parents if they were home and if we wanted to pick up a girl we had to go straight up face to face (no dating apps or anything similar).
It seems like Internet has made a huge impact on social interactions; I'm not saying it is all bad because it does allow a lot of people to socialize with like-minded persons all around the globe (which was previously unthinkable), but social customs which have been standard for centuries seem to be disappearing in just a few decades. And of course it has enabled lots of positive advances (universal access to information being for me the most important one).