句子结构准确，信息内容完整，篇章连贯。

　　One possible version 1：

　　Allan Stewart, of Australian nationality, was born on March 7th, 1915. He got his first degree in 1936, and then his second degree of Doctor of Medicine. He believes that one is never too old to challenge himself. Therefore, in his eighties, he decided to study law, and in 2006 he set a world record for becoming the oldest person to get a master’s degree. Because he was good at arranging his study time, he got praise from his teacher, and in 2017 he managed to get his fourth degree by network learning.

　　One possible version 2：

　　Born on March 7th, 1915, Allan Stewart, of Australian nationality, became the oldest man to obtain a master’s degree over the world in 2006. He believes that one is never too old to challenge himself. He got his first degree in 1936 and then his doctor’s degree in medicine. In his eighties, he decided to study law, after which he obtained his third degree in 2006. In 2017, he managed to get his fourth degree by online learning and won praise from his teacher for his good time management in study.

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