Combined photo shows the portrait of 68-year-old Zhou Nan (L) on Sept. 20, 2016 and Zhou having a class of Zheng, a traditional Chinese instrument, in the University for the Elderly in Tianjin, north China, Sept. 21, 2016. The University for the Elderly in Tianjin has 9 departments and provides various classes for a total of 26,730 aged students studying there. (Photo/Xinhua)
