Chao Mu-he, better known to his classmates at Nanhua University in southern Taiwan as "Grandpa Chao," said he began graduate school after being told he was too old to continue as a volunteer at a local hospital.

"I can't remember things as well as my fellow students," he said. "So before a test I would wake up at midnight and study all night. That way, the material was still fresh in my mind when the test began."

He specialized in the works of Chuangtze, a 4th century B.C. Taoist master.

Twenty-five-year-old classmate Liang Yu-chen described Chao as a polite and modest man who got on well with fellow students and paid great respect to younger teachers — making a deep bow before addressing them.