There's a number of threads currently on how cavemen (hunter / gatherers) lived. I believe the number given is around 30, but that's an average, including all the infant and child deaths and deaths in childbirth, and deaths from infections. So if you made it through childhood and didn't break a bone or get otherwise infected, cavemen typically lived well into their 90's in robust good health.
BTW a friend is thinking of moving to Nashville. Are there grass-fed meat available there, how about organic foods?