You get the old age pension when you reach the maximum age of service, which is now 60 years. When you reach 60 years, you have to go into retirement. This is the old age pension. It's called the old age pension because you cannot stay in service.
If you are 53 years old and an officer, and you have 40 years of pensionable service, you can get the pension. At the end of the month, you have a pension. Otherwise, you have to wait until you're 60 years old.