In the US, FAA, mandatory retirement at 56. You can ask for a waiver, but I have never seen anyone recieve one. Management can work longer. Alot of controllers go to work for contract towers or groups ( WCG ) with ATC training contracts if they still want to work as an ATCS or in the field. Controllers hired in 81-85 are just starting to hit this number if they were close to 30 when hired. Alot of the controllers hired then were 21 to 25 so the mandatory age will not be an issue for a while.