Students celebrate during their coming-of-age ceremony held at Wuxiang high school in Wuxiang County, north China's Shanxi Province, July 3, 2018. (Xinhua/Li Yong)

Students walk together with their parents to their coming-of-age ceremony held at Wuxiang high school in Wuxiang County, north China's Shanxi Province, July 3, 2018. (Xinhua/Li Yong)

Students cast letters written by themselves to the future into a box at their coming-of-age ceremony held at Wuxiang high school in Wuxiang County, north China's Shanxi Province, July 3, 2018. (Xinhua/Li Yong)