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Also helps that mitochondrial DNA from the matrilineal side is so reliable to track. It’s not just that agriculture was about 450 mothers ago - we can literally track who’s mothers they were, in order.
I somehow think that even 100 years ago mothers would start having kids sooner than 25
Even assuming 20 as the average age, that makes it only 50 women per thousand years (100 ish since 1 A.D.).
And I do think 25 is a solid guess. While you could def have kids younger, you can also have them older. 25 does feel old for average age, but also, 20 feels too young for an average.
Its probs somewhere between those two, but for math, me likey round number.
Your ancestor tree also expands exponentially (almost doubling with every generation), so everyone alive around the year 1250 AD is either one of your ancestors or no-one-around-today’s ancestor (because their line died out).
We are all related about 30 mothers out.
Yeah. I had thought about that, although I realized that it’s probably a little more complex due to genetic isolation; that is, you’ve got inbreeding several generations back, even more so if your ancestors were really quite homogeneous like the Japanese. Like, instead of it being 30 mothers out, it might only be 15 or less within your region.
