As it turns out, there's an even older surviving Pullman porter. His brother saw the story about Lee Wesley Gibson (above), and apparently made some calls...
"Ben Isaacs was also a Pullman porter. He began his railroad career in April 1936, according to the Chicago-based Newberry Library, which keeps data on Pullman employees. Isaacs retired in December 1968, records from the U.S. Railroad Retirement Board show.
"Most important, Isaacs was born Sept. 8, 1904 — six years before Gibson. That would make him 105."