The Future of Fertility

I'm pretty sure short of a disaster, we will all get get to long life expectancy. But let's just keep in the science and not the sort of science fiction. There could be parts of the world where we get a life expectancy in the mid 80s. And why would sub-Saharan Africa be any different? In most countries, there has been historically a shortage of land,. So in China, they were constantly pushing up against this, and as late as the 20s, there was a lot of infanticide in China.