Earlier quoted context omitted.
The best age for having kids biologically, in terms of health is... Close to 18. I had my first child when I was 27 and I was already very tired in the nights, we agreed with wife that it would have been better to start earlier. Some people have kids when 35-40 and I cannot imagine it at all. I'm too tired right now. Much wiser, but my health would not allow me to stay up nights
Biologically yes... Probably but maturity, stability wise closer to 30-35 seems to be pretty good. At least the going rate amongst my friends
We had our first child at ~30, so we track this trend, too. However, I sometimes think, what if we gave in to the biological trend and[0] had kids at 18-20? If that were the common trend, then... by the time i got 36, my kids would be on their way to starting their own families. I.e. my child-rearing day would've been over, right here, today. As it is, I'm about to turn 37, and am looking forward to some 15 more years of parenting.
No, I really am looking forward to this. But the point is, the life after parenting doesn't sound so appealing anymore, not when it starts at 50 instead of 36.
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[0] - Subject to the typical rules about age of adulthood, to not overcomplicate this.