Every individual on this site will have a different story on when they are eligible to retire and when they decide too. It is a matter of attrition for us long term employees, health coverage is a major issue to consider when you make that decision.
I was ready to retire about 10 years ago, mostly because of the work environment and my attitude, that and the aches and pains associated with working Full Time at UPS. Your human and even if you work the methods and take care of yourself this kind of physical work will grind you into the ground, the mental stress aspect of the job is a major problem also with all that is going on currently, it does affect your physical health.
This job is a marathon not a sprint, and do not expect the Company or Current Leadership in our beloved Union to give a damn, you are and alway will be a liability to both, so the solution is to look out for yourself and adjust your life choices, eat well and exercise and "Work Smarter not Harder".