Births to 40-year-olds are less common but a greater share than in 1960

Never before have such a high proportion of all births been to women over 40 -- they are now 2.8% of all births in the US. And yet a 40-year-old woman today is one-third less likely to have a baby than she was in 1947. From 1960 to 1980, birth rates to women over 40* fell,…