Major depression afflicts 1 to 5 percent of seniors living in the community, and it's far more common among those in home care and institutions, according to the National Institute of Mental Health.

根据国际精神健康中心的调查，忧郁症使社会中百分之一到五的老年人苦恼，而对于受到家庭照顾和在公共机构中的人来说就更常见了。

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The government's National Institute on Aging says regular activity can help seniors maintain their strength and be more independent, have more energy and better balance.

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But in return Marin delivered results above the national average: 96.8% of its seniors graduated, and 60.4% of them took the SAT college entrance exam and scored a mean 1133 (out of 1600).

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As of 2010, according to the 2010 National Assessment of Educational Progress, only 13 percent of high school seniors and 18 percent of eighth graders had a proficient knowledge of American history.

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