How old is too old to be president?

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Media Outlet: CNN.com

"Age is important politically, but it might not be the right way to think," said CNN contributor Julian Zelizer. "A young person can be ill. An older person can be sharp and totally on top of it."

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Julian Zelizer is a fellow in New America's Political Reform program. He is the Malcolm Stevenson Forbes, Class of 1941 Professor of History and Public Affairs at Princeton University and writes a weekly column for CNN.com.