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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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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