That’s also assuming you’re the first born of the first born of the first born, and so on. And the further back you go, the more individual kids the average mother is likely to have. After all, you had to have like 12 kids just so 3 of them would make it past 9.
So your greatx12 grandmother might’ve started having kids at 15, but she still might not have had your ancestor till years later.
Depending on the religion, yes. Otherwise it‘s 12 years per mother, 14 if you’re late.
That’s also assuming you’re the first born of the first born of the first born, and so on. And the further back you go, the more individual kids the average mother is likely to have. After all, you had to have like 12 kids just so 3 of them would make it past 9.
So your greatx12 grandmother might’ve started having kids at 15, but she still might not have had your ancestor till years later.
You would have a lot more death during pregnancy / childbirth though.