An old married couple had four boys.

老两口有四个儿子。

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Mark: You two are already squabbling like an old married couple.

马克：你们两个已经像老夫老妻一样斗嘴了。

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There was an old married couple that had happily lived together for nearly forty years.

有一对老夫妇在一起快乐地生活了将近40年。

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On the air, Ebert and Siskel bickered like an old married couple and openly needled each other.

NPR: Ebert, Nation's Best-Known Film Critic, Dies At 70

We sat there drinking lemonade, like an old married couple, watching the kids passing on bicycles, a squirrel scampering along a telephone wire.

NEWYORKER: Miracle Polish

But there is a more generous interpretation: that France and Germany, like an old married couple, have many interests in common and can agree to disagree on the others.

ECONOMIST: Franco-German relations