Huang Shu (L), a 95-year-old professor takes an oath during a CPC-joining ceremony at a hall in Huangshan, East China's Anhui province, June 28, 2011. Huang was born in 1917 and had taught math in the city’s colleges as well as its middle schools for 50 year before his retirement in 1989. He was approved to join the Communist Party of China days before the 90th anniversary of the founding of the party on July 1.