• A neuroscientist keeps his brain healthy and youthful with daily mental and physical exercises. • His routine includes biking, weight training, Sudoku, and dancing lessons with his wife every week. • He follows a Mediterranean diet, supplements omega-3s, and manages stress to support brain health.

By the time Dr. Majid Fotuhi hits 90 years old, he hopes to be just as sharp as he is today.

The Johns Hopkins neuroscientist has been studying the brain for more than 30 years to understand why our memory and cognitive function can decline as we get older — and how to preserve them.

It's a popular misconception that the brain is like an old computer that inevitably runs down as we age, he told Business Insider. In fact, he says, it's a living organ that can grow (or shrink) in response

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