55.3% of California births are to mothers age 30+. In San Francisco? 82.5%.pic.twitter.com/fdP4cxFAVR
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Yep. This.
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Interesting. All the stuff I've seen before has either been contingent on advanced maternal age, showed little risk <45 or appeared confounded by sexual selection factors (e.g. only fathers whose *first* children were born to them at an advanced age appeared to introduce risk)
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