I don't think having children is an expectation of young adults anymore by the general culture (or lack thereof), nor gettingeing married, nor especially both in the correct order.
Discussion
We pressured everyone to get married and have kids, including people who weren't called to it or suited to it, and the inevitable circus erupted. The Boomers broke all records in marital meltdown and made a mockery of the institution.
Marriage became something everyone just did, like buying a toaster or learning to tie their shoes, instead of purposefully choosing it to be the focus of their life and the hill they're willing to die on.
Now the marital stats look terrible and the children born of the circus are just shacking up or cycling through marriages like they really are just a piece of paper, so our entire society is becoming a gigantic, rundown ghetto.
Alright, I do agree with that. Different time scale.