Just wanted to add that my grandmother out lived my mother. She died at age 94 and always claimed that my aunt kept her young.
Yes, late births do indeed happen naturally, and like I said, when they do, I think that's great! A woman who retains her fertility that late has also retained both her bone mass and musculature, as they're all related. But a woman who cannot naturally have a child at that age is fighting to retain the rest of her physical capacities (I know, I'm dancing around menopause myself.) But, take a look at Diane Keaton. Do you think she's NOT fighting to retain bone mass and musculature?
As for older fathers, I agree that it is also an issue that Michael Douglas will be 80 when his children go to college. Unless he turns out to be a magnificent physical speciman, don't you think that's also cheating the kids? I do.
I just think that people need to think about more than just whether or not they want a child. In my example and yours, God voted, so that's fine, but in the case of old adoptive parents, or extraordinary measures to enhance the fertility of an older prospective mother, or older fathers, don't you think that people ought to consider what life as the child of such a much older parent will be like? I do. Having children isn't only, or even mostly, about the parents-- it's about the children.