You'll find that I neither post my kids' ages nor post pictures of them here, on Facebook, on my blog, or anywhere else on the Internet. I also don't talk in great detail about the more personal aspects of my life. I accept that most of the stuff I'd most want to keep private could easily be tracked down by anyone with a modicum of experience - in terms of personally identifiable "identity" info - but I keep my and my family's health info and other anecdotes about our intimate lives to myself. It's not going to work for everybody, and it does limit the kind of friendly sharing I can do with my "OO family," but there's a limit to how open I'm willing to be, and that's it. In fact, up until I won that BBQ contest and the trip to NYC, when my online and personal lives converged, I made a point of keeping them distinctly separate, and it would have been something of a challenge to track me back to this forum from anywhere else in my life (and vice-versa, most likely).
Anyway, my suggestion, particularly in light of Fishpants' position and concerns, would be for everyone to give some thought about what their comfort level is for sharing such info on the public internet, so at least they're acting within the guidelines they've set (if any) rather than in the absence of them.