I work where a large majority of us are eligible to retire at 57 without any penalties (full pension, instant access to retirement accounts, etc.) Still, many of them won't go until at least mid-70s. If I get the chance to leave earlier without penalty (I'd be eligible at 46 if the magic situation presented itself.)
I get a lot of "what would you do?!" "Oh, you could get a job and work part time!" Uh... no. I just tell them there are hundreds of things I want to do, and not a single one of those involves showing up at an actual job. Even at my job, where others kill time watching movies, playing games (think a job with downtime like a fireman--you have your daily duties, but you're mostly there for emergencies, especially when everyone else in town is asleep), I'm making quilts, sewing, doing crochet, cooking/baking, learning new recipes, etc. I'm not someone who will get bored without a job to go to!