Cobb County police are searching for a missing 82-year-old man who suffers from dementia.Odel Littleton was last seen at his home on Glenn Road in Powder Springs around noon on Tuesday. Littleton told his wife that he going to the Piccadilly restaurant in Marietta for lunch with friends. He was last seen driving a silver 2009 Chevrolet Silverado pickup truck with Georgia tag "BVJ8212". Littleton is described as a white male, 5'11" tall and 165 pounds. He was last seen wearing a plaid shirt and dark slacks, authorities said.Anyone with information on his whereabouts is urged to call 911.