Depression is becoming much less common among Americans over 55, according to a study by the University of Michigan Health Systems. The biggest improvement over the course of the 10-year study was recorded in the 80-to-84 age bracket, while the least improvement was noted in the 55-59 cohort. "If people from 55-59 are not yet able to get access to Medicare does that impact their ability to get treatment? We are not sure yet and need to look further into this finding," said Kara Zivin, assistant professor of psychology at the University of Michigan Medical School.

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