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Originally Posted by Johnny1A.2
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So almost all the women are going to have to have those 2 kids, and only those 2 kids, for the society to keep going over time. A handful might have more than 2, and a handful fewer, for whatever reasons, but that average cannot move much above or below 2.1 for more than a generation or two without Big Trouble.
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That combined with the necessity of everybody reproducing might or might not mean that the first child would be typically born to teenage parents. I could see arguments either way about the survival cost/benefit ratio on that.
I do suspect that marriages would be likely in place by the end of the teens more often than not, though. Time would be a valuable resource in this society.
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Why are you thinking in terms of a Modern-Western Nukular Family? It seems to make more sense for collective families, where people work, give birth, teach children, but those are not necessarily always the same people as the other group. That actually gives more flexibility to the society, as it can now opt to diversify or specialize its members depending on what makes sense at the moment.