Childless women don't age well. If they are saved from the effects of a never-pregnant climax on their arteries/metabolism, they will face a dementia cared by nieces. Not that mothers don't have these but physically and psychologically they are much less burdensome. The hormone flooding of pregnancy is a health blessing.
Needs citation for your argument. All I read today on this subject claims the contrary:
"Associations between number of children, age at becoming a parent, and dementia risk were similar for both sexes. Lifestyle and socioeconomic factors are more likely to explain the observed associations than normal pregnancy-related physiological changes."
* kids are and were always born in severely underdeveloped places like Africa and during hard times like famines or wars
* worldwide in the last 100 years and maybe throughout all history the education level and social freedom of woman severely impacts her fertility
Draw your own conclusions about the causes and solutions of the demographic problem