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在人口科学上,当老年人口在人口中的比例增大时,称之为人口老龄化。人口老龄化一词,来源于英语Ageing of Population,老年的年龄起点有不同的标准,这取决于研究问题的需要。联合国进行人口统计时,常以65岁为老年的起点,而在研究老龄问题时,特别是包括发展中国家的老龄问题时,多以60岁作为老龄起点。当一个城市或国家60岁以上人口所占比重达到或超过总人口数的10%,或者65岁以上
In the population science, when the proportion of the elderly population in the population increases, it is called population aging. The term population aging comes from the English Aging of Population. There are different standards for the starting age of older people, depending on the needs of the research questions. When it comes to demographics, the United Nations often starts at 65 years of age. When studying the issue of aging, especially when it comes to aging in developing countries, the United Nations uses 60 years as its starting point. When the proportion of the population over the age of 60 in a city or country reaches or exceeds 10% of the total population, or over 65 years of age