My retirement age without penalty was 55...long enough but still early enough for me. I actually left 15 months prior to 55 and held off collecting my pension until the non-penalty phase was reached. I never would have made it to 60, I would have left and taken the penalty.
You're lucky. If I work 20 years, I can defer and take unreduced at 60 but I won't get the retiree health insurance. If I work less than 20 years, it gets deferred to 62 for unreduced.
I have to work until 57 if I want the retiree health insurance and it would have a steep 25% penalty.