Twice as many childless women
One in five women in their mid-40s is childless - compared to one in 10 of their mothers' generation, new data show.
Some 19% of women born in 1967 did not have children by their 45th birthday, compared with 11% of women born in 1940.
The new 2012 data, from the Office for National Statistics (ONS), also reveal that women now have 1.91 children on average, compared to 2.36 among their mothers' generation.
One in 10 women born in 1967 had four or more children, as did almost one in five women born in 1940.
Women born in 1982 have had slightly fewer children on average (1.02) by their 30th birthday than women born in 1967, who had 1.16 children by the same age.
The data also showed that 383,189 live births in 2012 occurred within marriage or a civil partnership, compared to 346,485 that were outside marriage.
Of this last group, 304,606 births were registered by both the mother and father.
All the figures cover England and Wales.