That sounds a lot like Shaw’s Back to Methuselah, in which people lose interest in most (all?) social interaction, including sex, by about age 200 and prefer mathematics.
I don’t know what people would do to get enough novelty in much longer lifespans—it’s possible that sex could be made more complex and intense as well as mathematics becoming more fascinating.
That sounds a lot like Shaw’s Back to Methuselah, in which people lose interest in most (all?) social interaction, including sex, by about age 200 and prefer mathematics.
I don’t know what people would do to get enough novelty in much longer lifespans—it’s possible that sex could be made more complex and intense as well as mathematics becoming more fascinating.