How old is Mr. Li Yongle, the math teacher?

Teacher Li Yongle said in the Weibo that she was very old, and the exact age was unknown. Li Yongle's other information is as follows.

Li Yongle, male, is the most famous linear algebra expert in China. Professor, Department of Applied Mathematics, Tsinghua University, Vice Chairman of Mathematics Research Association of Beijing Higher Education Society.

personal data

The "line generation king", which is widely trusted by students, was once the head of the Beijing Mathematics Marking Group for the National Postgraduate Entrance Examination. He participated in the revision of the mathematics syllabus for postgraduate entrance examination and the proposition work of the national mathematics examination for many times and was received by the leaders of the Ministry of Education. Teacher Li Yongle compiled many reference books on mathematics for postgraduate entrance examination, which enjoyed a high reputation among candidates and were out of stock year after year. Teacher Li knows the questions and the key points of the exam like the back of his hand. His thinking of solving problems is extremely flexible, his counseling is highly targeted, his effect is excellent, and his achievements are remarkable, which is well received by the majority of students.

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Postgraduate entrance examination mathematics review book, linear algebra instruction lecture, 400 questions of mathematics full-truth simulation, 660 questions of basic mathematics, final sprint of mathematics 135 points.