You usually need 20 years of service.
Usually it is age + service year > 60 (or 61-63). and 20 years of service gives you a lot more benefits such as full pension and additional health insurance above medicare. So best year to start is before 45.
Usually it is age + service year > 60 (or 61-63). and 20 years of service gives you a lot more benefits such as full pension and additional health insurance above medicare. So best year to start is before 45.