Good post NL. In the same order of idea, i remember when i was at the high school, my teacher explained, about population and war losses, by using this stuff called
population pyramid
.
Here's one for France but, of course, many other countries will have similar statistics.
About war losses and consequences, the specific points are 1 and 3 on the graphic. Translating the French, it gives "Birth deficit due to war", WW1 for point 1 and WW2 for point 3. Of course, dead people don't make childs...