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Suppsedly there are scientific facts that back up the thing that at least in the case of women, the earlier they have their kids, the less likely the kids are to end up with various health problems.
It's not guaranteed a child will end up with issues if a woman is "old", but the chances for it to happen are like twice as high or something.
I don't remember exactly tho, none of these things are really relevant to me anyway.
If I ever decide I want to have kids, I'm going to look into foster care or adoption.