[captainmuon]

Right, but lets say between 1920 and 1990? The difference would be less pronounced. I would say there was a discontinuity in the 90s and 2000s. But it is entirely possible that once everything has been "internetized", we will reach a plateau for the next decades.

[rgejman]

Just restricting ourselves to the developed world: Being able to call anyone in the world from your home? Not having to worry about food scarcity? Not worrying about being drafted into an army? Political and technological differences have drastically changed life between 1920 and 1990. I bet any 70 year epoch that covers the development of the internet or mobile phones, will have the same features. Who knows what's next.