the front page is now like half articles on this currently, so it’s probably time for a megathread because none of us want to keep track of 12 threads on this subject and all the resulting comments. only major subsequent developments (for example, boots on the ground; pronunciations by governments; that sort of stuff) will get their own thread. otherwise please post stuff in here for the time being. any threads not meeting this criteria will be locked and removed. thank you in advance for your cooperation.
I'd recommend you take a look at the demographic pyramids of countries in Africa. Mortality is steepest in the 14-34 range because that's when most people die.
That's nonsense. Feel free to investigate the demographics of the World, Africa, Niger, Ukraine, China, or the US, to get a feel for "infant mortality" or "when most people die".
https://www.populationpyramid.net/
Have you ever looked at the tool you sent?
Please, do put in Niger and find out (FWIW, your tool is very low granularity and I know there are visualizers that show it at a more fine scale).