Aside from how other people have responded to this, which is all really solid stuff, the "demographic timebomb" looks like... China having a median population age almost identical to that of Europe's by 2050.

How terrifying!
(Also note that the average age of Europe is skewed by certain countries having significantly younger or older populations, so what this will look like in 2050 for individual countries in Europe will be of more interest demographics-wise.)
I wonder if the libs are equally concerned about the "European demographic timebomb"? Maybe Gordon Chang can pivot and start writing about the coming collapse of Europe when his immanent-collapse-of-China grift collapses?