noun
population pyramid
A bar chart showing the distribution of a population by age and sex, typically used in demographics.
日本の人口ピラミッドは高齢化を示している。
Japan's population pyramid shows an aging population.
人口統計 refers to population statistics in general, while 人口ピラミッド specifically denotes the graphical representation.
Compound of 人口 (population) and ピラミッド (pyramid), a calque of English 'population pyramid'.