Getting gray, silver, or white is a natural part of growing older.

变灰，银，或者白是一个正常的衰老的部分。

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And this is responsible for a growing percentage of happy older people.

这是根据有幸福感的老年人的增长百分比得出的。

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And this is responsible for a growing percentage of happy older people.

这是根据有幸福感的老年人的增长百分比得出的。

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