Right. I check the population statistics once in a while. It should be easy for actuaries and statisticians to come up with working data to perform some better projections for SS.
Have noticed that my grandparents had 9 children and 32 grandchildren. Since that generation, the number of children per family has decreased from 0 to 1. I have 4 offspring to support my SS benefits - in addition to the 40 years I and my employers paid into it.
Yes the raw data is there. It is whether the answers are the right answers AKA the ones they want.
And again yes as far as the demographics of family size - depending on the original ethnicity and national origin, and time of entry / assimilation vs “maintaining diversity” by not assimilating.