Senior citizens play the instruments at an elderly care service center in Longta Subdistrict of Yubei District of Chongqing, southwest China, Nov. 17, 2017. Several elderly care service centers have been set up in this subdistrict to enrich senior citizen's life. (Xinhua/Wang Quanchao)

Senior citizens learn paper cutting at an elderly care service center in Longta Subdistrict of Yubei District of Chongqing, southwest China, Nov. 17, 2017. Several elderly care service centers have been set up in this subdistrict to enrich senior citizen's life. (Xinhua/Wang Quanchao)

A staff member checks the blood pressure for an old woman at an elderly care service center in Longta Subdistrict of Yubei District of Chongqing, southwest China, Nov. 17, 2017. Several elderly care service centers have been set up in this subdistrict to enrich senior citizen's life. (Xinhua/Wang Quanchao)