Gathered together, the old, the middle-aged and the young studied side by side and encouraged each other.

老、中、青济济一堂，共同学习，相互激励。

《新英汉大辞典》

The findings contradict the long established belief that the amount of sleep we need falls as we approach middle and old age.

这项研究反驳了长期以来的观点，即随着年龄的增长，我们需要的睡眠时间会变短。

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The first problem has been to find a middle way between the old, cumbersome top-down target regime and the emphasis on competition promulgated by the Tories and, eventually, by Tony Blair.

困境之一是要在古板呆滞又纪律严明的目标制度和保守党所倡导的（最终由托尼•布莱尔主导）的对竞争的强调之间找到一条中东路径。

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The Echo was disproportionately read by skilled manual workers and by the middle-aged and old.

ECONOMIST: Local newspapers in peril

The BBC's Alison Homewood, director of sales to Europe, the Middle East, Africa and India, says the old favourites - 'Allo 'Allo, Absolutely Fabulous, Fawlty Towers - continue to do brisk business.

BBC: The language of laughter

They are easily distinguished from each other and the region can still steer towards an energy-only nuclear future, something that is essential given the tumultuous collapse of the old regimes and the emergence of new governments across the region ( The Middle Class, Energy And Terrorism).

FORBES: Israel Has Nuclear Weapons, But Only Iran Has Nuclear Power