Grandpa Zhang on the mountain bike looks pretty spritely! At 83, the veteran cyclist has already biked a total of 60,000 kilometers, equivalent to one and a half times around the globe. His next goal is to ride to Xiamen for some outdoor recreation, mountain biking... These fashionable extreme sports are no longer only for the young. Zhang Zhaofeng from the Wang'ai community of Baise subdistrict in Jiangdong district...