Now that is open for some debate as I have mentioned already (sorry if I"m sounding like a broken record here) the data that doctors use is from decades past and during that time period many of the women who were TTC then were women who had been unable to conceive and thus were still trying for pregnancy. Coincidentally, women in their 40's may also have health issues that women in their 20's do not. Do we really KNOW what a healthy woman in her 40's with proven fertility, what her chances are, no we don't. Some oft-quoted data indicates it's 50-60% miscarriage rate 42 and up. But heck, like Han Solo says - never tell me the odds.