This is my thought, too. I agree that it'd be great to see more female characters childless and happy about it. But it's also overwhelmingly normal to want to settle down and/or have kids, and it's also normal that you come to feel this way even after experiencing your youth without wanting that. I don't think it's a statement or anything, just people experiencing life the way, well, most people do.

I'm also wondering what OP means by "characters who express no desire to have kids". I would get being irritated if a character strongly talks about how she doesn't want to have kids and her decision should be respected, and then goes baby crazy later on. But I wouldn't expect to see a scene with a character just talking about how one day they would like kids as a foundation for them wanting them later.