That's not the truth in lots of individual cases. I'm 32, and a ton of my friends, even those in long-term committed relationships, do not want and haven't wanted kids for years by now. It's more socially viable to not have kids. Most people can't afford a house, usually you need two parents working so then you have to pay for daycare which is like another rent at least usually. Not to mention how damn expensive raising kids is outside of just something like buying a bigger place to live.

And then you get to spend all of a few hours awake together each day, and for the first year or two of that life those waking hours are filled with crying, pooping, and getting puked on (teenagers are scarier though lol). A chunk of my friends just don't like kids and don't want to be parents. This has been a continuing trend for the last 10 years or so, I don't have a huge number of acquaintances who have had kids. I don't. It's more than a full time, draining job, and I'd rather those who don't want kids not have kids and not be forced into something they don't want to do.