The problem cuts across all socioeconomic lines and affects all age groups.

这个问题超越社会经济的所有界限，影响各个年龄段的人。

《柯林斯英汉双解大词典》

Declining mental function is often seen as a problem of old age, but certain aspects of brain function actually begin their decline in young adulthood, a new study suggests.

心智功能衰退通常被视为老年问题，但一项新的研究表明，大脑功能的某些方面实际上在青年时代就开始衰退了。

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What do you have to say about the problem of old age?

关于老年人问题，您有什么要说的？

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The problem was that he was so much a part of the age he described, the "Roaring Twenties."

VOA: special.2010.11.21

The problem may last a few seconds, but it can get worse and worse with age, leading to a heart attack or stroke.

VOA: special.2010.03.02

Lemelson died in 1997 at the age of 74, but the foundation that he set up promotes problem-solving through invention and innovation.

VOA: standard.2009.12.18

But what about the elderly and the problem of age-related decline?

FORBES: World of Warcraft May Protect the Aging Brain

His real problem is age.

ECONOMIST: The centre-left holds on for now; can Silvio Berlusconi?

This is not a problem that can be solved by industrial-age collective action models because the problem is the end of the industrial age.

FORBES: Kubler-Ross and #OccupyWallStreet