Enforcement Act of the Part of General Principles of the Civil Code Article 3-1

The effective date of Article 12 and 13 of the Civil Code, which were revised on December 25, 2020, is January 1, 2023.Majority is attained on January 1, 2023 for those who have reached the eighteenth year of age but not the twentieth before January 1, 2023.Those who are already entitled to the rights or interests up until the twentieth year of age or majority according to acts and regulations, administrative dispositions, court decisions or contracts, but have not reached the twentieth year of age on January 1, 2023, may still be entitled to the rights or interests until the twentieth year of age unless otherwise provided by law.
中文原文 民法總則施行法第3-1條
中華民國一百零九年十二月二十五日修正之民法第十二條及第十三條,自一百十二年一月一日施行。
於中華民國一百十二年一月一日前滿十八歲而於同日未滿二十歲者,自同日起為成年。
於中華民國一百十二年一月一日未滿二十歲者,於同日前依法令、行政處分、法院裁判或契約已得享有至二十歲或成年之權利或利益,自同日起,除法律另有規定外,仍得繼續享有該權利或利益至二十歲。

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