Maybe she's under age." "No, not under age."

也许她未成年”，“不，她成年了”

耶鲁公开课 - 心理学导论课程节选

Now at the outbreak of the Peloponnesian War Socrates was just under 40 years of age.

伯罗奔尼撒战争爆发时,苏格拉底才快要接近40岁。

耶鲁公开课 - 政治哲学导论课程节选

The median age in Afghanistan is under 18.

阿富汗人口的年龄中值低于18岁。

普林斯顿公开课 - 人性课程节选