Just something I was talking about with some friends today.
Most of our group are still unsure if they want any, or if they have had them, it's after they've ticked other things off the list.
I was a bit unusual as I had them younger than the rest, but I work with children, was the first to get married, and have never been ambitious, so got to that stage sooner I suppose. I definitely wanted to do a few things first though!
We were talking about how all our mothers were still quite young (60s) but even though they have all worked and done plenty of other things in their lives, they all seemed sure from their teen years that they wanted to get married and have kids, and if you go up a generation before that, our grandmothers would say things like "all I ever wanted was children"
We've never heard this from anyone recently, so came to the conclusion that 1)women who want the marriage and kids combo above all else are a bit wary of saying so, because people see that as a bit boring these days, or b) previous generations just said it because it was expected of them.