"Women" aged 15 shouldn't be having children anyway. Make the age range more reasonable. Make it between age 21 and 40. Then I betcha fewer than half of American women don't have children.
I never have children and I'm over 40. My choice was not based on feminism or following a cult or whatever the repliers here are saying. I didn't have children because I have no parental instinct and I don't like children.