M3 Date

I looked up the date (approximate) of the M3. It was towards the end of a particular run of this version (of the M3) during 1955.

In other words, this camera is 50 years old. Well that certainly must have been a different sort of world that made things like this. Will the future archeologist dig up through technological layers and find that the last strata before the digital age was the mechanical / atomic age?

How long did the mechanical age last? A few hundred years? I wonder how long the digital age will last. And what will come after it in the technology stratum.