In addition, couldn't the later menopause be explained as a direct result of lower oocyte consumption? With 9 months of pregnancy, that's 8 or 9 fewer ovulation

In addition, couldn't the later menopause be explained as a direct result of lower oocyte consumption? With 9 months of pregnancy, that's 8 or 9 fewer ovulation cycles, so wouldn't it makes sense for a woman with an extra child to have menopause a few months later? I'm no reproductive specialist here, but that seems like a reasonable assumption to me. Add in the selection bias (women with later menopause are more likely to have an unexpected child at a late age), and this really could turn out to be an experiment with no notable findings.