A 107-year-old woman, dubbed the “age-defying granny,” has trended on mainland social media for her sound health and sharpness of mind.Centenarian Ding Guijuan lives in Cixi, a small city in the eastern province of Zhejiang.The local media outlet, Love Cixi, which is operated by the municipal propaganda authority, reported her story.AdvertisementIn the coverage in mid-April Ding shared her longevity tips and sent good wishes to her fans.Ding Guijuan, above, can still get around on her feet, albeit with a little help. Photo: BaiduAccording to Ding’s daughter, Chen Xingchao, 84, physical examinations of her mother showed her health was up to…