We should be careful about statistics for "age at first marriage". Common flaws are to look only at "nobles" (who marry for political reasons), to look at the l

We should be careful about statistics for "age at first marriage". Common flaws are to look only at "nobles" (who marry for political reasons), to look at the lowest recorded/permitted age as if it were typical, and to assume when menarche happens (which depends highly on nutrition). But one way or another, polygyny must necessarily be linked with killing men. The birth ratio is practically fixed in the absence of sex-selective abortion.