[icebraining]

Among women born in 1960, 17% in the U.S. were childless at approximately age 40, compared with 22% in the United Kingdom, 19% in Finland and the Netherlands, and 17% in Italy and Ireland. Rates ranged from 12% to 14% for Spain, Norway, Denmark, Belgium and Sweden, and from 7% to 11% for several Eastern European countries and Iceland.

http://www.pewsocialtrends.org/2010/06/25/childlessness-up-a...

The population of childless aged couples, especially women, is expected to grow rapidly. In Italy and the US, for example, the population of childless women aged 65 or older is expected to nearly quadruple over the next four decades.

http://yaleglobal.yale.edu/content/childless-choice

Statistics in the UK for women by age (e.g. 20% for age 50):

http://www.neighbourhood.statistics.gov.uk/HTMLDocs/dvc211/i...