[watwut]

> once a person reached 30 they could expect to live to at least 60

First not true. Looking at wikipedia, "If we do not take into account child mortality in total mortality, then the average life expectancy in the 12–19 centuries was approximately 55 years. If a medieval person was able to survive childhood, then they had about a 50% chance of living up to 50–55 years."

Also, 30 is quite a lot. It means, you survived childbirth if you are woman. First one is the most dangerous. It means, you did not got injured in accident with animal or tool in your teens and twenties - when you are at your physical prime and do heavy work the most.

> As for people measuring psychological stressors

I think that child mortality is yet another stressors they faced. But also, if your relative is bipolar or has schizophrenia and whole family lives in one room cabin, I can only imagine things to become super stressful for everyone.