Dick Van Dyke  is opening up about how his wife helps keep him young. In his new book, “100 Rules for Living to 100,” the 99-year-old legendary actor reflects on his life and the lessons he’s learned along the way, while also sharing tips on how to live a long life. The book features anecdotes from his time on “Mary Poppins,” “The Dick Van Dyke Show,” “Chitty Chitty Bang Bang” and other classics, while also focusing on his marriage to Arlene Silver , 54, whom he married in 2012. “Arlene is half