We then discuss the growth and composition of the working-age population (age 15-64) for the world as a whole and for separate countries and regions. For the world as a whole the working-age population will continue to grow, increasing by 20% between 2010 and 2030. This is a slower rate of increase than in previous decades, however, with the growth rate continuing to fall in the coming decades. We discuss the rapid changes in age distribution that will be observed in all regions, with the older population growing faster than children and youth. The youth component of the working-age population (age 15-24) will increase by only 3% between 2010 and 2030, while the population aged 45-64 will increase by 42%