In a population without changes in lifespan, the median birthtime will increase by one year for every year that passes. E.g. say for simplicity that life expectancy is 80 years and noone died before 40, then the median birth year in 2020 is 1980, and 2030 it is 1990 and so on.
If life expectancy increases, this with go slower. I dont know the numbers, but I would think median birthtime increases with 10-11 months per year in the developed world today.
If people stopped dying and new people were born at constant rate, median birthtime would still be increasing with around 6 months a year.
So in a democracy, I would expect moral development to continue, although at a somewhat slower rate.
Of course, if we look at the birthtime of the 10% oldest, that would only increase with around 1⁄10 year per year, so there might develop an old elite. Still, people born before, say, 2100 would become a smaller and smaller minority, and the same can be said for any other year.
A few thoughts about the old guard problem:
In a population without changes in lifespan, the median birthtime will increase by one year for every year that passes. E.g. say for simplicity that life expectancy is 80 years and noone died before 40, then the median birth year in 2020 is 1980, and 2030 it is 1990 and so on. If life expectancy increases, this with go slower. I dont know the numbers, but I would think median birthtime increases with 10-11 months per year in the developed world today. If people stopped dying and new people were born at constant rate, median birthtime would still be increasing with around 6 months a year. So in a democracy, I would expect moral development to continue, although at a somewhat slower rate.
Of course, if we look at the birthtime of the 10% oldest, that would only increase with around 1⁄10 year per year, so there might develop an old elite. Still, people born before, say, 2100 would become a smaller and smaller minority, and the same can be said for any other year.