A community volunteer offers training service on smartphone usage to senior citizens in Changsha, Hunan province, in January.Taobao, China's top e-commerce site, has introduced a browsing interface for older consumers. It is among the companies hoping to expand sales by making it easier for seniors to shop online. On Taobao's new interface, photos and words are larger, there are fewer buttons, and functions are displayed more clearly on the front page. Nearly all links and informati...