85% of women have children at some point in their lives. This is just a fact. You may know that you're not having kids, but the vast, vast majority of people don't make that choice.
After all, all the people who didn't want kids, and had a choice about the matter died childless and never passed on their anti-replication genes.
15% of women ages 40-44 in the USA have never given birth, from which we can pull 85% of women ages 40-44 have given birth, as of 2014.