Why did Zhang Guiping, Procurator-General of Xuchang City, resign?

Zhang Guiping, Procurator-General of Xuchang City, resigned due to his age. According to the relevant public information, Zhang Guiping, the chief procurator of Xuchang Municipal People's Procuratorate, offered to resign as the chief procurator of the Municipal People's Procuratorate because of his age. According to the provisions of Article 27 of the Organic Law of People's Republic of China (PRC) Local People's Congresses and Local People's Governments at All Levels, the 43rd meeting of the Standing Committee of the Seventh Xuchang Municipal People's Congress decided to accept Zhang Guiping's request to resign as the chief procurator of Xuchang Municipal People's Procuratorate and report it to the Seventh Xuchang Municipal People's Congress for the record.