It's become a cultural norm: women of a certain age cut off their hair.

已经成为文化范畴：一定年龄的女性剪掉他们的头发。

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For many of us below a certain age, use of the web is routine, and our children have only ever known a world where going online is an accepted norm of everyday life.

对于中年以下的人来说，运用网路是件习惯成自然的事情，而我们的下一代所了解的世界也是一个将上网作为生活常态的地方。

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Conclusions: 1. The norm of the ZM2.1 diagnosis system should consider the age and education level.

结论：1、确定ZM2.1诊断系统各功能亚项常模时需考虑年龄、文化程度的影响。

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In the historic centers of Kyoto and Kamakura, where 13th-century monuments are the norm, age becomes relative.

WSJ: Selling a Piece of Old Japan, to Save It