名词短语
中文翻译：按年龄划分的人口组成
同义词：
['age distribution', 'age structure', 'age breakdown', 'age grouping', 'age distribution', 'age composition']
例句：
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1. The government is studying the population composition by age to better understand the needs of its citizens.
政府正在研究按年龄划分的人口组成，以更好地了解其公民的需求。
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2. The study found that the elderly population in the city is increasing at a faster rate than other age groups.
研究发现，该市老年人口的增长速度比其他年龄段快。
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3.The report highlights the importance of age composition in planning for future generations.
报告强调了年龄构成在规划未来世代方面的重要性。