Nor, despite the increase in average lifespan in the rich world over the past few centuries, is post-reproductive survival a modern phenomenon.

ECONOMIST: Why women live so long

The post-war "baby-boom" generation is now reaching reproductive age.

CNN: The Abortion Dilemma

Post-Cairo, the talk is of women's rights and reproductive rights, meaning the right to a free choice over whether or not to have children.

BBC: The world at seven billion