The flight from marriage

In 83 countries and territories around the world, according to the United Nations, women will not have enough daughters to replace themselves, unless fertility rates rise. In Hong Kong, for example, a cohort of 1,000 women would be expected to give birth to just 547 daughters, at today’s fertility rates. In some Western countries, a quarter of people in their 30s are cohabiting or have never been married, while half of new marriages end in divorce. Marriage continues to be the almost universal setting for child-bearing in Asia: only about 2% of births took place outside wedlock in Japan in 2007.

In 2010 a third of Japanese women entering their 30s were single. Perhaps half or more of those will never marry. In 2010 37% of all women in Taiwan aged 30-34 were single, as were 21% of 35-39-year-olds. This, too, is more than in Britain and America, where only 13-15% of those in their late 30s are single. If women are unmarried entering their 40s, they will almost certainly neither marry nor have a child.
http://www.economist.com/node/21526329