maximum age of enlistment
If an individual has prior service time, this time will be subtracted from his/her age in order to determine if their age is compatible with the maximum age limit. For example, if a 37-year-old Marine with 10 years of service desires to reenlist in the Marine Corps, his/her age will be 27 for enlistment purposes. Although the maximum age for enlistment is 35, any individual older than 28 is required to request an age waiver.