Why is the threshold for boredom 80 years?
Empirically, it seems to be nearly identical to the age of retirement as things stand. Lots of 70 year olds are just punching the clock most of the time(though there's certainly exceptions).
I don't claim that we've extended life as long as our attention spans can allow. I think we could live longer and be okay. But current human psychology and culture are not designed for extremely long lives, even if we solved the issues of physiology.
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