Does anyone know how old a member of 2PM must be to perform military service?

Nichkhun is Thai, so he doesn't have to do military service in Korea, but he has already done it in Thailand, so he doesn't have to do it because the conscripts are full and there is no lottery. (Thailand is also a compulsory military service system, but the number of conscripts is limited, so there is a lottery, but Thailand is also obliged to become a monk, that is, a man must shave his hair for at least three months after he is 20 years old to represent his adulthood and be the head of the family. Ni Kun hasn't practiced yet). Zeyan still wants to do military service because he gave up his American citizenship. South Korea requires military service before the age of 30, and can apply for an extension, but it won't be long. It is said that South Korea is now applying for a new policy for celebrities, that is, people who have contributed to the country (promoting South Korea) like Rain can refuse military service, but it is still under review.