Staying Sharp: The Surprising Power of the Aging Brain

Scientists used to think intellectual power peaked at age 40. Now they know better

It took Barbara Hustedt Crook an awfully long time to get around to writing her first musical. She started last year, shortly before her 60th birthday. Her friend and collaborator, Robert Strozier, waited even longer; he's 65. It's not that they didn't have the creative chops for the job. The two have spent their careers writing and editing in New York City, and Crook has a background in performing, singing and piano. But creating a musical always felt just out of reach--until now.

"Somehow I have a confidence I didn't have before," says Crook. "I find that my brain makes leaps...

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