So it would seem the trend is very much to settle and stabilize in your 30's. I do hope we figure out even better and safer ways to allow women to give birth a little later, if they so choose.

It also seems useful to become a parent with that extra decade of life experience. And if we incentivize exercise in the later years, it could offset the "feeling tired at 70" thing? My fiancé's grandpa runs marathons and honestly has more energy than I do!