Child and Juvenile Welfare and Rights Protection Act Article 111

Children and juveniles placed by the special municipality or county (city) competent authority in accordance with this Act who reach the age of eighteen and are evaluated as unable to return home or live independently may continue to be placed until they reach the age of twenty; those who have enrolled in a university or college may be placed until graduation.
中文原文 兒童及少年福利與權益保障法第111條
直轄市、縣(市)主管機關依本法委託安置之兒童及少年,年滿十八歲,經評估無法返家或自立生活者,得繼續安置至年滿二十歲;其已就讀大專校院者,得安置至畢業為止。

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