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[Correspondence] Regional population structures at a glance

Population ageing is a major demographic challenge for humanity. Since population structures evolve slowly and predictably, the demographic, economic, environmental, and social problems of ageing have been anticipated and discussed for many decades.1 Yet the focus of these discussions has always been the elderly population, with elderly people often defined as those older than a threshold—eg, 65 years or age at retirement—or with a certain number of estimated remaining years of life.2 Such a focus is quite reasonable and understandable but not entirely correct.