I don't disagree with the points being made but average life span is skewed by infant mortality rates being ridiculously high in the past. Stone age people could well have lived to old age if they made it through childhood.
I don't know how to put it more clearly, if you were born in the stone age (or any other age that had high infant mortality rates) and didn't die in childhood you could expect to live until you were at least 65 years old. People weren't considered a "good age" when they died at 40 or 50 in those times.
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