“Mean” age just means that there were an equal number women younger than 20 and older than 20 being married. It doesn’t mean it’s the “norm.”
Plural marriages, involving 14-17 year olds and married women, aren't even close to the societal "norm" (but neither was lying about it...or seer stone fraud, or banking fraud that leads to bankruptcy, or copying masonic rituals, or falsely translating plates and funeral papyri, or destroying printing presses, or adultery, and so forth).
***“Mean” age just means that there were an equal number women younger than 20 and older than 20 being married. It doesn’t mean it’s the “norm.”***
BTW, you couldn’t be MORE wrong here, either. The Mean is the average. What you are meaning to use is the MEDIAN, or middle.
P.S. I notice that some of the studies show the AVERAGE age for women varying from 22-24 in the stats shown on THIS thread. That still doesn’t demonstrate a younger marrying age. It simply shows variation in source citation.