The population is aging: in 1950, 2.6 percent of Americans were over 74; by 1995, the percentage was 5.6.

Over the last 150 years, Thursby's population has clearly aged.

Japan's population is aging more rapidly than any on the planet - by 2015 one in four Japanese will be elderly.

The population has aged since Osler's day; many of its older members are healthy and active.

As more young people depart, the population is aging.

"We knew the population was aging and people need to keep fit," Belle said.

Over the past 150 years, the population has clearly aged.

China's population will age rapidly because of the one-child policy.

The working population will age almost everywhere, but not at the same time, and not gradually.

The blood supply is in danger, and the population is aging.