"Figure 2: Percentage of women remaining childless at age 45 years and at age 30 years, 1920 to 1987","" "England and Wales","" "","" "Notes","1. The 1945 cohort is assumed to be their mothers' generation because the average age of mothers giving birth in 1972 was 27 years, and so women of that age were assumed to be born in 1945." "Unit","%" "","" "Year","By 30th birthday","By end of childbearing" "1920","33","21" "1921","30","18" "1922","30","18" "1923","29","16" "1924","28","17" "1925","29","17" "1926","28","16" "1927","28","16" "1928","27","15" "1929","27","15" "1930","25","13" "1931","25","14" "1932","25","14" "1933","23","13" "1934","21","11" "1935","20","12" "1936","20","12" "1937","20","12" "1938","19","11" "1939","19","12" "1940","18","11" "1941","18","11" "1942","18","11" "1943","19","12" "1944","18","11" "1945","18","10" "1946","18","9" "1947","22","12" "1948","21","11" "1949","23","13" "1950","24","14" "1951","26","14" "1952","26","14" "1953","28","15" "1954","30","16" "1955","30","16" "1956","32","17" "1957","33","17" "1958","34","18" "1959","36","19" "1960","37","19" "1961","38","20" "1962","39","20" "1963","40","20" "1964","41","20" "1965","42","20" "1966","42","20" "1967","42","19" "1968","42","18" "1969","43","18" "1970","43","17" "1971","44","18" "1972","46","18" "1973","47","" "1974","47","" "1975","48","" "1976","48","" "1977","47","" "1978","47","" "1979","46","" "1980","46","" "1981","45","" "1982","45","" "1983","46","" "1984","47","" "1985","47","" "1986","48","" "1987","47",""