Thirty-six years ago this week I started working as a programmer. My first job was working at a defense contractor. I had no experience or education in programming other than some high school classes (we had a teletype machine connected to some mainframe somewhere) and my own self taught ability in BASIC on an Apple II+.
Imagine for a moment I had today a time machine and could go back to that first day to tell myself what my life as programmer would be in 2017 (ignoring the obvious time travel paradoxes). I can guarantee I would have been amazed, or possibly unbelieving that a world like we have today could ever exist. The differences between then and now would be almost unexplainable to that young version of myself.
Take another step and imagine that version of myself took a time machine back another 36 years to visit my dad. Turns out that would be a month after the end of World War II. My dad barely survived the war (and thus in a way I did too). He would not have understood the concept of a computer, had likely never seen a television and maybe would have been amazed that the world was no longer at war. But 1981 would not have seemed all that different to what he knew otherwise. What changed between these two 36 year periods? The pace of change changed.