Act of Military Service System Article 15

Enlisted Soldier Service are divided into Standing Soldier Service and Replacement Service.The proceeding year of a man reaching the age of 18 is the Recruiting Age for the Enlisted Soldier Service.
中文原文 兵役法第15條
士兵役分為常備兵役、補充兵役。
男子年滿十八歲之翌年,為士兵役之徵兵及齡。

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