How long did the Native Americans live on average? What was their life expectancy?
The answer to this question entirely depends on your definition of Native American, which is an extremely sweeping term. It would be similar to attempting to give an average life expectancy of Europe today, which is extremely difficult due to differences in lifestyle, accessibility to medicine, and genetic traits.
From archaeological evidence, it is clear to see that life for the average Native American was extremely arduous, with most skeletons showing severe spinal damage, multiple fractures, and osteoporosis. In general, a large number of individuals in this period died before reaching the age of five, with most people dying in childbirth or shortly after. Even by the age of twenty it was expected that around one in five individuals would die before the age of thirty due to violence, disease, or accidents. In all, if an individual was lucky enough to make it to 30, they could expect to live until around 70, but only a minor fraction of people were able to reach this age.
Upon the arrival of European colonials, however, this life expectancy entirely collapsed, with over two thirds of the Native American population dying due to disease or warfare in a period of only thirty years.
Again it is important to stress that each tribe and region would have entirely different life expectancies, and all of these numbers are only estimates rather than solid fact.