Great thread and interesting discussions.
I think there are a few things around this.
There is a lack of knowledge amongst women; about how the female reproductive system works (when I read Taking charge of your fertility when planning TTC with DS, I was astonished at how much I didnt know).
There is a total lack of knowledge about not only how it gets harder to fall pregnant when you get older, but also how it does become harder to carry a baby to full term with few complications.
Whilst this information is out there; I think that unless you are in a receptive mode - i.e. really open to understanding and taking this information on board; it generally gets ignored.
I have a good friend, 33 in a relationship with a great guy. But she is having doubts about staying with him. She seems to think she has time to meet someone else and start thinking about ttc when she is 35 (and that is if she meets someone else and they are in the same place). We are very close and you know what it came down too?
What would she be more devastated by? Staying with a guy (who a year in is not ticking all the boxes and therefore she compromises on some of the things she is looking for in a person), but he is ready to have kids and they can start ttc while she is still 33 - so you could argue stands a better chance of having DC's
Or meeting mr perfect, but maybe not definitely managing to have children.
But I can say this for sure; she is trying to make the decision without all the facts. When I asked her whether she knew why it got harder. She said no. And asked me why. I was less than 15 seconds in and she said 'you know what, I lied, I don't want to know'
And I think there you have it. The women who want to know find out. The women who dont ignore because they dont want to hear it.