Mark_Friedenbach comments on Facing the Intelligence Explosion discussion page - Less Wrong Discussion
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No. Still throughout most history it was the exception to live much longer than child bearing age (14-30).
i can find many sources claiming the opposite (for example, http://books.google.com/books?id=EFI7tr9XK6EC&pg=PA62&dq=life+expectancy+ancient+rome+infant+mortality&hl=en&sa=X&ei=zniRUKH5Ae--2AW6sIDICQ&ved=0CEEQ6AEwBw#v=onepage&q=life%20expectancy%20ancient%20rome%20infant%20mortality&f=false http://books.google.com/books?id=zlsaLgBdLF8C&pg=PA44&dq=ancient+world+life+expectancy+compared&hl=en&sa=X&ei=JhyEUaKhEqmiiQKZ0YCoBQ&ved=0CDoQ6AEwAQ#v=onepage&q=ancient%20world%20life%20expectancy%20compared&f=false ) and few agreeing with you
cite?