Half of the emerging HIV infections occurred in the 15-24 age group.
在新发生的HIV感染中,大约一半发生在15-24年龄组。
参考来源 - 河南省某校在校大学生艾滋病知识、态度、行为研究·2,447,543篇论文数据，部分数据来源于NoteExpress
同义词： age group age bracket cohort
以上来源于: WordNet
N-COUNT An age group is the people in a place or organization who were born during a particular period of time, for example, all the people aged between 18 and 25. 年龄群
...a style that would appeal to all age groups.
...将会吸引各年龄群的风格。
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