Act Governing Retirement, Severance, and Bereavement Compensation for the Teaching and Other Staff Members of Public Schools Article 19

When the employing school duly carries out staff downsizing because of the school's closure, merger, or restructuring, voluntary retirement shall be approved for a staff member who meets any of the following circumstances1. Has been employed for 20 years or longer.2. Has been employed for 10 years or longer but less than 20 years, and is aged 55 or older.3. Has been at the highest seniority salary level in his or her position for 3 years or longer, and is aged 55 or older.
中文原文 公立學校教職員退休資遣撫卹條例第19條
教職員配合學校停辦、合併或組織變更,經服務學校依法令辦理精簡並符合下列情形之一者,應准其自願退休:
一、任職滿二十年。
二、任職滿十年而未滿二十年,且年滿五十五歲。
三、任本職務年功薪最高級滿三年,且年滿五十五歲。

English translation for reference only; the Chinese text prevails. Not legal advice.