联合国经济和社会事务部：2023年世界人口老龄化最不发达国家人口老龄化的挑战和机遇报告（英文版）

The United Nations created the category of the least developed countries (LDCs) in 1971 to mobilize international support for sustainable development in places facing the most severe structural impediments. The majority of the 46 LDCs (as of 1 October 2023)1 are in sub-Saharan Africa and are currently in early stages of the demographic transition, the global trend towards longer lives and smaller families. Most of the LDCs in Africa continue to experience high levels of fertility, rapid growt