Dick Van Dyke is slowing down at age 99. The TV icon, who turns 100 on Dec. 13, opened up about the current state of his health in a new essay for The Times . “It’s frustrating to feel diminished in the world, physically and socially,” Van Dyke said. “I get invites to events or offers for gigs in New York or Chicago, but that kind of travel takes so much out of me that I have to say no,” the “Mary Poppins” star continued. “Almost all of my visiting with folks has to happen at my house.” Van