year = c( 1543, 1600, 1665, 1746, 1774, 1830, 1858, 1864, 1896, 1901, 1905, 1926 )
age = c( 40, 34, 23, 40, 31, 33, 49, 33, 34, 43, 26, 39 )
DF = data.frame( year=year, age=age )