By mid-century (2050) Nigeria is projected to be as populous as the US

Africa overtook Asia in 2020 to become the main source of population growth. 

The UN reports that more than half of the projected increase up to 2050 will be concentrated in just eight countries, mostly in Africa

Globally more than 1bn people will be aged over 65 in 2030 with 210mn aged over 80, about double the numbers in 2010. Older people already account for about a quarter of the population in many countries including Japan, Italy and Germany.

UN World Population Prospects report https://population.un.org/wpp/

Global population growth hits lowest rate since 1950

FT 11 July 2022

https://www.ft.com/content/6b131d91-1834-4243-bb8b-dc49060b1450

Global Population Is About to Hit 8 Billion—and Some Argue It Is Near Its Peak

“There’s two big questions,” Mr. Lutz explains, that determine whether his forecasts or the U.N.’s end up closer to the mark. “First, how rapidly fertility will decline in Africa…. The other question is China, and countries with very low fertility, if they will recover and how fast they will recover.”

WSJ 12 August 2022

https://www.wsj.com/articles/global-population-is-about-to-hit-8-billionand-some-argue-it-is-near-its-peak-11660252977

The UN expects the global population to reach 8bn in November, and to surpass 10bn this century

Sub-Saharan Africa’s share of the globe’s population will rise from one-seventh today to more than one-fifth by 2050. 

Just eight countries will account for more than half the rise in population expected by 2050: 

the Democratic Republic of the Congo, Egypt, Ethiopia, India, Nigeria, Pakistan,

 the Philippines and Tanzania.

The Economist 11 July 2022

https://www.economist.com/the-economist-explains/2022/07/11/which-countries-are-driving-the-worlds-population-growth