如今，长寿的人越来越多，但年龄相关性心智衰退病例的增加却给原本的好消息蒙上了一层阴影。
More people are living longer these days, but the good news comes shadowed by the possible increase in cases of age-related mental decline.
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。
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.
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