The book Sex at Dawn demonstrates this using the latest anthropology and archaeology if you want to know more.
Until recently, it was normal for tribal societies to live longer on average than agricultural societies. All of the statistics that support the idea that tribal life is short were done very poorly and skewed by abortion/infanticide.
Tribal societies would have the same lifespans on average as our society does today and perhaps even longer because they had far healthier diets and always got lots of exercise.
However, they would keep their numbers low through infanticide and eugenics. For instance a baby with birth defects would often be allowed to die and abortions using certain drugs were normal.
Anyway, the idea that tribal life was brutish, solitary and short is utterly wrong on every point.
The science indicates clearly:
- it was less brutish on average with more social harmony and warfare was less painful for all involved
- it was not short at all, quite the contrary. Only modern agricultural societies, through scientific medicine, have begun to approach the lifespans of tribal societies who are not interfered with. This was just a myth from the very start.
- it was not solitary. Our society is solitary. In a tribal society, every person is surrounded by lifelong friends and relatives at every moment of every day for their entire lives. Modern man can scarcely imagine the depths of human bonding that tribal societies experience.