At around age 60, "muscles really start to break down," say Kathryn Starr, an aging researcher, "and because of that, the protein needs of an older adult actually increase."

在60岁左右，“肌肉真的开始分解，”一位研究衰老的研究员凯瑟琳·斯塔尔说，“也正因为如此，老年人对蛋白质的需求实际上增加了。”

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One possibility relates to the ATP-making machinery's emission of free radicals, which are thought to contribute to aging and to such age-related diseases as cancer by damaging cells.

一个可能的解释与制造 ATP 的组织释放出的自由基有关，人们认为它通过破坏细胞来促进老化，并且导致这种像癌症一样的和年龄有关的疾病。

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For example, when 600 people age 85 and older were asked to identify the key components of successful aging, the answer that topped their list surprised even the experts: resilience.

例如，600名85岁以上的老人在如何成功优雅变老的问卷中做选项时，答案最多的选项使专家们都瞠目结舌：适应力。

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And the entire fleet of vehicles is not aging gracefully either, with an average age of 13 years, made worse by years of tough use.

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After all, in the spring of 1997, when Microsoft announced the acquisition, WebTV Networks was a two-year-old stripling of a startup with an oversized marketing budget, an aging demographic (25% over the age of 50) and a scant number of subscribers (less than 100, 000).

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An analysis of data from the past three censuses shows that because of baby boomers' "aging in place, " the population of those age 45 and over grew 18 times as fast as the population under age 45 between 2000 and 2010, said William Frey, a demographer and senior fellow in the Metropolitan Policy Program at the Brookings Institute.

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