All around the world a big percentage of the workers is reaching retirement age, and there are less people to fill the jobs as they become open. A few of the articles that I read suggest that because of the decline in the number of workers, the world's economy is going to decline. In an article titled "Productivity Can Make Up the Gap" http://yahoo.businessweek.com/magazine/content/05_05/b3918035.htm
the authors suggest that just because there is a declining number of workers, the world's economy can still grow. According to the acticle the average productivity in Japan, per worker, has increased 2% each year since 1980. If the trend continues productivity will rise 169% by 2050, raising Japan's GDP by 72%. I would tend to agree with the latter article, if countries can increase productivity then the world's economy will continue to grow steadily, even with fewer workers. For productivity to increase countries needs to provide education and encourage innovation.