Year	Age
1775	26
1870	27.1
1880	27.1
1890	26.8
1900	26.8
1910	26.4
1920	26.5
1930	26.5
1940	26.5
1948	25.9
1960	25
1970	23.7
1980	25.2
1990	27.7
2005	32.4