Thanks Ery, facts I was never aware of. My daughter would have been around 13-14 as far as I know. Was not privy to that info as her mother and I went our separate ways before then.
The fact that girls can become sexually mature much earlier than boys easily explains why 18yrs girls seem to be much more emotionally and intellectually advanced than boys at that age.......and I am basing that, not on theory, but on the experience of employing young people, both boys and girls for a long time.
It was quite striking how you could devolve responsibility to 18yr old girl, but give it to an 18yr old guy, there would be a guaranteed fuck up.
So in the context of the thread, what age is too old too have a baby, maybe the window of childbirth shuts sooner when sexual maturity begins earlier in life.