The stratification technique gives us the minimum age of an object, which isn't necessarilly its true age.

分层技术给我们提供一个物体的最小年龄，但不一定是它的真实年龄。

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Both companies set 13 as the minimum age for users.

两家公司都将13岁作为使用者的最小年限。

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The minimum age for the draft has been lowered to 15.

征兵的最小年龄已降至15岁。

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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

At the heart of the controversy were changes to marriage laws, including articles that set the legal minimum age for marriage at 18, recognize only civil marriages, allow joint property ownership, expand parental rights, and extend inheritance rights to girls.

VOA: standard.2009.08.27

Texas lawmakers recently tried to increase the minimum age to 21, but the plan stalled.

WSJ: NYC proposing raising age for tobacco purchase

Under the bill, the minimum age for buying a pet would rise from 12 to 16.

BBC: NEWS | UK | UK Politics | Animal bill 'won't kill circuses'

Each state sets its own laws for the minimum age to purchase cigarettes -- in most states, it's 18.

CNN: Why cigarettes are here to stay