Jiang Chengbo looks at an ancient book in his bookstore(R). Two customers pick up books in Jiang’s bookstore (L). [Photo/Yangtze Evening News] A 90-year-old man who runs a 117-year-old antique bookstore inherited from his grandfather has become an internet celebrity, Yangtze Evening News reported. Jiang Chengbo, the owner and third generation successor of the bookstore, said…