Say what? Absent warfare and epidemics and with proper hygiene someone who had survived childhood could expect to live to 70.
Compare Psalm 90: "The days of our years are threescore years and ten"
Compare Psalm 90: "The days of our years are threescore years and ten"
Granted, most of the risk was due to midwives and doctors (especially doctors) not understanding or carrying out proper hygiene.