cifey comments on An Especially Elegant Evpsych Experiment - Less Wrong
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to spare anyone the effort: I presume it's because they begin having children, and only future children are relevant.
One aspect, when the kids reach reproductive age they are now at least partially competition, so the parent child relationship can take on more of a sibling flavor. So loss of an 8 yr old would could cause more grief than a 18 yr old.