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 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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