在句中,也可用an aging population;population aging;The Aging of the Population等。
举例:
1、The plan requires establishing the basic institutional framework for tackling population aging by 2022. By the middle of the century, a mature institutional arrangement that meets the needs of a great modern socialist country should be put into place.
2、It calls for improving the national income distribution system, steadily increasing the pension reserves and establish a fairer and more sustainable social security system.