(Portland, OR)  --  The Cowlitz County Sheriff's Office is looking for a missing 91-year-old man.  Wilford Johnson's car was found empty near Mt. St. Helens on Friday.  Johnson was last seen Thursday morning and was reportedly at the Dollar Store in Longview mid-day.  Johnson is considered fit for his age, is five-foot-eleven-inches-tall and 180 pounds with blue eyes and balding gray hair.