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I agree that the LW should dump her "husband" ASAP; tomorrow wouldn't be soon enough. And 40 is NOT too old to have a child, unless you've already gone through menopause.
As for whether or not the letter is a fake, my BS detector did not go off, and I've been running my own advice column for a while now on a site that probably gets a thousand times more trolls than Cary. So I do have a little experience in the field.
Her HUSBAND was possibly (probably) lying, but there was nothing in her own letter that rang terribly false to me.
Still, for those with better BS-detectors than me, perhaps you should go over to http://advicenators.com/ and start your own columns. Show Cary how to do it right. Which I suspect is something that most people here secretly want to do anyway. :D