Why do people who like to pick their terminal year, pick 40? Round number?
40 is like, the end of general education, and the beginning of specialisation for some.
Traditionally, in some circles, the end of youth, and the beginning of adulthood.
Personally, when I had made certain paradigm shifts around the age of 21, I figured it would take me till the age of 40 to contemplate the nature of the idea, as a matter of quality assurance.
40 was the expected lifespan of man in precivilisation, half their expected span in modern times, and a third of the greatest known spans.
As the genome progresses. So it prunes. One day, something else will be the norm. We would not recognise it.
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