Historical reproduction ALSO isn't useful when contraception is now a prevalent thing the numbers would in no way match. Regarding the last I couldn't find the claim that 4 to 5 women reproduced for every man so I'm just going to assume you misread. I cannot imagine how this could possibly be so unless you meant within a narrow age range considering men can reproduce for most of their lives and women most do so within a narrow range.
Looking at the same graph at the head of the page in 1998ish there was about 20% of the most effected age range who hadn't had sex in a year. It's now 28 and in fact the graph goes up and down and it seems that other age ranges are less effected.