You're joking, right?
The average lifespan of hunter-gatherers and up through the dark ages who had minimal to zero science, was about 35 to 40 years. The most common non-combat killers were injuries, disease, parasites, and poor nutrition. Many died in childbirth. A simple scratch could easily get infected and eventually kill the person via gangrene.
Superstition ran supreme and innocent people were frequently murdered after being falsely accused of crimes. People declared witches were murdered. Travel was arduous and dangerous. Got a dying tooth? C
Cope with the awful pain until it finally does die and fall out.
People have this fanciful belief that life in the distant past could be a "bit" difficult, but overall, satisfying. In reality: It was extremely dangerous, and your life was likely to be quite short.