[quote name='http://www.econlib.org/library/Enc/Population.html']Fluctuations in Generation Size
Fluctuations in generation size also cause problems. When a small generation pays high taxes to support a large retired one, as will soon happen in the United States, issues of fairness arise. Changes in generation size also affect the labor market. When the small U.S. generation born in the depressed thirties reached the labor market in the fifties, its small size relative to the demand for new workers brought it easy employment, high wages, and rapid advancement. But when the baby-boom generation reached the labor market in the seventies, it experienced relatively high unemployment, low wages, and slow promotion. This picture is complicated by immigration, as well as changing patterns of international trade and education. If the future imitates the past, however, the baby-bust generation entering the labor market in the nineties may again do relatively well.[/quote]http://en.wikipedia.org/wiki/Image:Worldpo...th-billions.jpg
According to thove wikipeida image, looks like they don't expect the population to have as big as a "jump" as it previously has.
Just pulling some statistics and random stuff off of website...