I never had the "I want to have kids" feeling. Ever. On top of that, my first wife was medically barren. After the 3 years of hell with her, I went over a decade as single.
My current wife and I married in our late 30s. We agreed at that time that we were both too old to have kids (the science is crystal clear).
We discuss our regrets but it has worked out well for us in a lot of ways.
But the loss of fecundity in the West is certainly an issue and I suspect my situation is odd, like the rare "successful single mom."
And thats the way I like it. To each their own.