My parents both retired from their main jobs after 30 years. My dad was 49 and my mom was 53ish. Daddy then went to work full time until he turned 62. Momma worked part time at odd jobs. She was working back with the school system as a part-time reading teacher because they couldn't afford to bring in a full-time person (& she thought it was important to have a reading coach in the school) up until she died at 62.5.
My in-laws: FIL retired in his early 50s from the state, then went to work full time with a consulting firm until he hit 62. He's gone back a few times part time to help out since. (The owner of the company has had some health issues, and trusted him to run the projects until he could get back, etc.) MIL retired completely at 60, with 25 years of service.
-Kris
DS (9/05)
DD (8/08)
DD (9/12)