Life expectancy increases with age as the individual survives the higher mortality rates associated with childhood. For instance, the table above listed the life expectancy at birth among 13th-century English nobles at 30
17th-century English life expectancy was only about 35 years, largely because infant and child mortality remained high
During the 20th century, despite a brief drop due to the 1918 flu pandemic[56] starting around that time the average lifespan in the United States increased by more than 30 years, of which 25 years can be attributed to advances in public health.
And so on.