On the verge of his 100th birthday, Dick Van Dyke sits down with TODAY’s Al Roker to talk about his new book called “100 Rules for Living to 100: An Optimist's Guide to a Happy Life.” He also reflects on his life and legacy and opens up about his iconic films including “Mary Poppins” and “Chitty Chitty Bang Bang” and reveals the role that he still wants to play.

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