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Why is the recruitment age of teachers in Xiamen so strict?1born on March 25th, 986 can apply for 201/year?

College graduates and undergraduate graduates are under 25 years of age (born after June 30th, 1986, excluding June 30th), and Xiamen graduate students and former unemployed graduates are under 30 years of age (born after June 30th, 198 1, excluding June 30th).