Among the countries currently classified by the United Nations as more developed (with a total population of 1.2 billion in 2005), the overall median age rose from 28 in 1950 to 40 in 2010, and is forecast to rise to 44 by 2050.
在目前联合国承认的发达国家中（其2005年总人口为12亿），总体中位数年龄从1950年的28岁升至2010年的40岁，预期到2050年将为44岁。