On 2012-09-12 1:11, Joseph McAllister wrote:
Why did it take so long to attain that, as an average?
According to a class I took years ago, the answer is infant mortality. IIRC, the professor claimed that if, in 1776, you ignored the deaths of those less than either six or ten years old in the calculation, the average lifespan was over 60, rather than the under 50 or so that you get when you include the infant/child deaths.
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