The world's oldest panda in captivity has turned 37. Xin Xing, which has outlived most of her peers by two decades, was treated with a cake made with her favourite foods at special birthday party at the Chongqing Zoo in southwest China on Friday. According to the zoo, Xin Xing, whose name means 'new star', is about 110 years old in human age. "Giant pandas usually live into their teens ...