N Rapid Growth Slow Growth Zero Growth (Kenya) (United States) (Denmark) Age Year of birth 85+ Before 1905 80-8别 1905-1910 1910-1915 1915-1920 65-69 1920-1925 Male Female 60-64 Male Female 1925-1930 1930-1935 Male Female 1935-1940 1940-1945 1945-1950 1950-1955 1955-1960 949 1960-1965 1965-1970 1970-1975 10-14 1975-1980 1980-1985 1985-1990 1086420246810 1086420246810 1086420246810 Population (% Population(%) Population (% 人口种群的年龄结构图 人口种群的年龄结构图