我们球队与凯尔特人比赛的队员平均年纪只有23.9岁。
利兹大学的研究结果显示，年轻人比中年人更容易患上网瘾，上瘾人群的平均年纪在21岁左右。
In the Leeds study, young people were more likely to be Internet addicted than middle-aged users, with the average age of the addicted group standing at 21 years.
自从20世纪以来女孩青春期开始的平均年纪极度下降。而现在的平均年纪是12岁，虽然这个平均值仍然平稳。
The average age at which girls start puberty fell dramatically over the 20th century: While the average is now 12, although the average is now levelling off.
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