名词
中文翻译：共同的层龄同义词
同义词：
['common age', 'common age group', 'common age range']
例句：
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1. The common age group of the population is between 20 and 30 years old.
人口的共同年龄组是20到30岁之间。
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2. The common age range for retirement is typically between 60 and 70 years old.
退休的共同年龄范围通常是60到70岁之间。
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3. The common age for children to start school is around six years old.
儿童开始上学的常见年龄大约是六岁。