I thought you not the worker set out his retirement time but the employer. And all countries government have their retirement date for all their workers. And that is why those who joined the civil service work retired late in the old age. Those who joined late sometimes work till at the age of 70s but normally I'm my country retirement age is 65 years. Because at time your not smart again so you are to rest and receive your retirement benefits at home. And they was a time the government was planning to reduce the years and I don't k ow if they have reduced it to 55 years because I am not part of them so I won't know.
You can only spelled out your retirement age if you are self-employed and not working for anyone because the person must have a say over you.