The world’s population is growing older — bringing a wide array of challenges to both rich and poor countries. « Global Aging: The Challenge of Success, » a new report by the Population Reference Bureau, points out that people age 65 or older already make up nearly one-fifth of the population in many European countries, and that the share is rising. Authors Kevin Kinsella, of the U.S. Census Bureau, and David Phillips, of Lingnan University, Hong Kong, argue that before long, many industrialized countries may have more grandparents than grandchildren. Less developed countries are also seeing their populations grow older, ushering in new social problems for societies that have few public support systems. By 2050, 1.2 billion of the nearly 1.5 billion people age 65 or older will reside in less developed countries. Population aging has been driven by low or falling birth rates that have reduced the numbers of births each year, and improved health and medical care that have enabled people to live longer. Italy is the world’s « oldest » major country, with nearly 20 percent of its population age 65 or older. Japan, Greece, and Germany rank close behind. Many European governments are concerned about the social and economic strains
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