A third to half of the severe and fatal cases have occurred in young and middle-aged people who were previously healthy.

有三分之一到一半的严重致命性疾病发生在健康的青年和中年人身上。

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A recent survey shows that in China, more than 70% of the office workers have stomach troubles, with most being young and middle-aged people.

最近一份调查显示中国70%的办公室职员有胃部问题，其中大多数是年轻人和中年人。

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At the same time, it is important to note that around one third to half of the severe and fatal infections are occurring in previously healthy young and middle-aged people.

同时，必须注意到，严重和致命感染病例中约有三分之一到半数是原本健康的年轻人和中年人。

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Migraine headaches are most common among young adults and middle-aged people.

VOA: special.2009.03.18

And elderly people unable to work should get the same benefits as young people and middle-aged people unable to work.

ECONOMIST: Letters

They were young and middle-aged workers, people who lived in Beijing but did not have the much-prized residency permit that would allow them to settle with their families.

BBC: Changing China seen from the 'hard seats' of a train

Most important of all, in offices, on construction sites, on football pitches around the world, the great, complex, social, co-operative endeavours which typify our species and make us human, in all of these you find middle-aged people telling supposedly sharper and stronger young adults what to do.

BBC: Viewpoint: Just what is middle age?