https://www.npr.org/sections/thetwo-way/2014/01/22/264850945/almost-no-poor-nations-by-2035-thats-what-bill-gates-says

In 2035 every country will be part of the developed world.

That's why the world population will max out at 8.4 billion in 2035, and will be dropping every year after 2035. There will be two parents having one child all over the planet.

Developed countries don't have that many kids once they get a lot of tech

Also we will be having the sixth paradigm of computing so it will be a 10 to the power of 6 increase.