U.N. analysts deploy many tools to project world’s population
Washington Post - USA
Conjuring up uncounted people by cross-referencing census data with surveys and other statistics is a common trick of the demographics trade, one of several methods used recently by researchers at the U.N. Population Division to arrive at their landmark population projection: 7 billion people inhabiting Earth on Oct. 31. (...) The United Nations is regarded in most quarters as the gold standard of population projection, but not everyone agrees with its estimates. ,…(24 October 2011)

UN: World population projected to reach 9.3 billion by 2050, 10.1 billion by 2100
Washington Post - USA
The U.N. said in a report on world trends released Tuesday that global population is expected to officially hit 6.9 billion on July 1 and 7 billion on Oct. 31. Most of the increase is expected from the world’s “high-fertility countries,” especially in sub-Saharan Africa. U.N. Population Division Director Hania Zlotnik said the projections depend on expected fertility rates, with populations in many nations aging as medical advances allow people to live longer and families opt to have fewer children. ,…(3 May 2011)

In aging China, a change of course
Washington Post - Washington,DC,USA
... alarmed by their city's low birthrate and aging population , ... according to the UN Population Division , while the number of residents 60 and older is ... (12 December 2009)

The World Won't Be Aging Gracefully. Just the Opposite.
Washington Post - United States
According to the United Nations Population Division (whose projections are cited throughout this article), the median ages of Western Europe and Japan, ... (4 January 2009)