candidate: Having survived until the age of 21 , a male member of the English aristocracy in this period could expect to live : 1200–1300 : to age 64 1300–1400 : to age 45 ( due to the impact of the bubonic plague ) 1400–1500 : to age 69 1500–1550 : to age 71 In general , the available data indicate that longer lifespans became more common recently in human evolution .