I think you could ask that question to ten different people and get ten different answers.

I personally don't think there is any set age that makes a woman no longer suited to having a baby so I wouldn't even try to come up with a number.
I think your question isn't about what "women" in general should do; it's about what you as an individual should do, and nobody can tell you that. Your coworker might think that you are too old to have a baby and she may have good reasons for thinking that. But what she thinks is largely irrelevant...unless you expect her to be involved with the raising of your hypothetical baby!
No diagnosis, lots of opinions, and a bunch of issues that I haven't quite figured out.