My original post was mostly a snarky comment on the inappropriate use of a summary statistic that is misleading.
Child mortality was also very large so the median(WAG)* is probably higher, maybe 5 or so.
I only picked on the Middle Ages since that was the most recent comment that I had seen (There were no old people!!!!).
The Renaissance likely made things worse.
* WAG = Wild Ass Guess. It's a technical term.