The number of the elderly 老人 in such a population 人口 is
                increasing rapidly as compared to other groups (for
                example, children 孩子 and young adults 年轻人). In 
                  
                  statistical 统计学 terms,
                the median age 中位年龄 of this population is rising. For
                some, an ageing population 老龄化 lǎo
                  líng huà is deemed a demographic problem
                人口问题.
            
              
                The shift in
                    median is normally attributed to the following:
                
                o   
                    better healthcare systems 医疗保健系统
                o   
                    more social and recreational activities (for the
                    elderly)
                o   
                    increased life expectancy as quality of life gets
                    better
                o   
                        declining mortality rates
                o   
                    family planning leading to decreasing birth rates
                o   
                    migration to regions of ageing population 老龄化 lǎo
                      líng huà.
                
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