i didn't want to bog down with even more statistics, but
birth rates among the white native population is on part with japan and europe. the sections of the populations that are pumping out extra babies to compensate for that decline are the ones that up to one or two generations ago weren't in the US and certain "non indigenous" religious populations. hispanics especially but also foreign born "whites"
my point is foreign borns are driving population growth of the US which lessens the effect of the aging native population on US society, problems that are paramount in other developed nations.
As I said, agree with the overall point but much to the discomfiture of folks like Buda, there's a whole other conversation on who is and is not pumping out babies in the US.