Edith Kah Walla was at the front of a crowd of students that welcomed Cameroon's new president Paul Biya on a tour of the United States in 1984, full of hope that the young leader would bring stability and democracy, and end corruption.
Four decades on, Biya, now the world's oldest leader, turns 90 on Monday. When he cuts a large cake, as he usually does on his birthday, Kah Walla, who was one of Biya's challengers in the 2011 presidential election, will not be celebrating.
