Many woman don't prepare their bodies for pregnancy, which makes it become an uncomfortable or even miserable experience in their lives. This does not need to be so. The better prepared a mother is, the better it is for both her and her child. "The Secret World of the Unborn Child" in chapter three of my book, It's Time to Wake Up, 1stbooks.com, offers great insights into what happens before, during and after pregancy.
A 40 year-old body with a clean liver is younger than one that is 25 years old with a congested liver. Age is a very relative description of time that changes according to experience. There is plenty of time left for a 35-year old woman to become pregnant if she is phsyically well prepared.