The Pony Express hired young men. They were often younger than 18 years old.

驿马快信公司雇佣的都是年轻人，他们通常都在18岁以下，且身材极瘦。

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In a recently published study (one survey conducted in 1993; the follow-up in 2009), researchers found that about 80 percent of participants younger than 30 years old dreamed in color.

在最近发表的一项研究中(这项研究在1993年就开展了，2009年又进一步研究)，研究者发现，大约80%年龄在30岁以下的人做的梦是彩色的。

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This medicine should not be used in a child younger than 18 years old.

18岁以下儿童不可服用本药。

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The 34-year-old Rajoelina, who is six years younger than the minimum age required by the constitution to be president, earlier announced he was forming an interim government that would revise the constitution and hold elections within two years.

VOA: standard.2009.03.18

That successor will be chosen by 115 cardinal-electors (those younger than 80 years old) through ballots held in the Vatican's Sistine Chapel.

BBC: Pope Benedict XVI recalls joy and 'choppy waters'

The list includes electrocardiograms for asymptomatic patients, imaging tests for routine back pain, and Pap smears for women younger than 21 years old.

CNN: Doctors and patients should talk more, test less

The University of Oklahoma Medical Center and Children's Hospital together treated 93 patients, who ranged in age from younger than 4 years old to older than 85.

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