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Its population is rapidly aging, which looms as a major problem over the next 30 years.

人口也正在迅速老龄化，这个问题在以后30年内将越来越突出。

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But by far our most serious problem is a declining and aging population.

但是到目前为止，我们最严重的社会问题是人口下降问题和老龄化的问题。

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The aging population initially posed a problem for hair-product makers.

WSJ: Old Hair Days: Products to Help Manage Gray and Thinning Hair

The economic benefit of immigration is in part about how big of a problem our aging population is.

FORBES: Does An Aging Population Hurt The Economy?

On top of this lies the problem of an aging population, exacerbated by the size of the baby boomer demographic.

FORBES: mHealth: The Next Frontier For Mobile Service Growth