This is something I've often wondered (morbid curiosity I guess) and we were discussing this at work the other day. I think many of us have probably come to these forums because of fantasy based games that take place in the middle ages (basically games that could take place between the 5th through the 15th century). And while they make for great games, books, and a few movies I think most of us realize that it would have been a hard life during those times with, disease, famine, war, lack of hygiene, etc...
So, I've read in a lot of places that 1/3 of all children died before the age of 5 and during that time period 35 was old ... that'd make me ancient at 45. Although I think I stood a good chance of dying at the age of 10 if I'd been born in that time period and somehow the events in that period ran parallel to the events that took place in my life.
Age 10: My tonsils needed to be taken out. I may have survived if I was in a more advanced area of the world, it was the late middle ages, and infections didn't kill me.
Age 15: My appendix ruptured. If I survived past age 10 this would have been it
After having this discussion at work we realized most of us in that conversation would have not lived as long as we have. I wasn't the only one who had a ruptured appendix, one lady survived briast cancer, others had injuries that required modern day medicine to fix, a few childhood ailments, etc. In thinking about it I realized probably 2/3 of everyone I know wouldn't have made it to their current age.
Hopefully this didn't come off as morbid, just one of those odd things I think about sometimes