The upper age limits for Defence Forces Personnel serving overseas is governed by Paragraph 108 of Administrative Instruction C.S. 5 (New Series). Officers may be nominated for overseas service up to the retirement age for their rank. The age limits for Privates and Corporals is under 45 years of age on the scheduled date of deployment, for Sergeants it is under 50 years of age on the scheduled date of deployment. Other NCOs may be nominated for overseas service up to their retirement age for their rank.
There are circumstances in which certain enlisted ranks can be granted an age waiver for a specific appointment, within a specific mission. Such waivers are conditional and can only be approved by the Deputy Chief of Staff (Support) where there is 'no equally suitable candidate under the designated age limit.'
Administrative Instruction C.S 5 (New Series) came into force in June 2013 and I have been advised by the Military Authorities that there are currently no plans to review this specific aspect of the instruction.