P.S.: Why are they cramming the pregnancies so close together? Prince George and his sibling will only be about 20 months apart. Kate has another 20 years in which to have children.
LOL, what? She's 32 years old.
And the average age of menopause is 51.
Menopause is just the point at which your body cant produce children - not the point at which its unrealistic to have them. Lurker is entirely correct to say LOL. She has 10-12 years left and about 5 with OK odds. Everything is downhill from 27 in this area and fast downhill from around 37 (to the point of falling off the cliff
).
EDIT: So according to this chart it starts sliding from the early 20s, before its going downhill for real.