Great thread here!
I retired from my professional career at age 57 (I will be 79 in May), moved to the Columbus, Ohio area and worked in a few "after retirement" jobs to make some additional cash and until SS would kick in for me. Tried the "great elephant graveyard of all professions," Real Estate, for about 5 years and then really hung up my spurs. I have had mixed emotions about retiring at 57 and, on balance, I would count it a mistake. I had a nice job in Corporate Purchasing and could have worked there a few more years, assuming I did not get "tagged" by the essentially annual "right-sizings" that occurred. But, hey, a card laid is a card played.
I had worked at something every year since I was 11 when I had a paper route. I enjoyed the independence it gave me in doing and buying whatever I wanted without having to "grovel" before my parents. (I am overstating here, but you get the idea.) I always had some type of job at least part of the year (golf caddy, nursery worker, delivering beer, delivering groceries, construction, etc.) and I enjoyed working. My bride was the same and began working when she was 14 in a pharmacy at the soda fountain. She eventually became a pharmacist and worked at that profession until she was almost 70, because she loved that profession so much.
Lastly, I would like to point out that virtually every company that I worked for in my professional career either failed or was significantly reduced after I left its employ. (Westinghouse, Digital Equipment Corporation, NCR, Kodak) Not drawing any conclusions, just sayin'...