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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"But they continue to age because aging is separate from their disease," Hayflick said.

“但是他们会继续变老，因为变老和他们的病是两码事。” 海弗利克说。

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And entire industries have grown up around the idea of productive aging, the third age, or all the other marketing euphemisms out there.

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"This is the first compound that has been shown to slow aging when initiated in middle age, " ways Matt Kaeberlein, a researcher at the University of Washington.

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Diabetes prevalence increases with age, so the aging baby boomer population is attributing to rising costs.

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