No.
Conscription age is till December of the year in which you turn 36.
You have one-year grace period, beginning the day next to your return to the Republic of China if you previously had a household registration, or beginning the day next to your initial household registration following your return to the Republic of China if you have never had a household registration.
Act Of Military Service System
Article 3
A man aged 18 starts his military service day from January 1st of the proceeding year and be discharged on December 31st of the year at the age of 36, called the Male’s Service Age. However, the discharged age of fficers , NCOs and volunteer soldiers are not restricted to this rule.
The so-called Man of Approaching Service Age refers to the period from January 1st of the proceeding year of a man of 15 years old, to December 31st of the year he reaches the age of 18.