We used to have early retirement,but not anymore.
But I can tell you,those who chose when it existed never complained or wanted to get back. But they all also got other positions within company. So they keep their salaries +/- and got pension. There is no need any more to pass medicals,assessments,language testing, etc. Most of them don't have to do shiftwork or night shifts. But the most important they don't have any responsibility anymore.