Another FWIW here. My Megacorp retired me at 55 which was somewhat unexpected so my 60 days to prep for it were not quite enough for me (I wanted to work 2 more years).
Now 8 months into *ER* I"m still adjusting to the free time after 31 yrs of M-F and commuting etc.
What I've found is there are jobs out there if you want to work retail for $11 an hour or if someone would bring you back on full-time corporate again---but seriously age discrimination is real.
Our winters are long here in Seattle so I chose to start traveling some which has been very cool. You meet folks who don't talk about work much at all (I was in Nicaragua, Colombia next).
My other advice which others have mentioned is having a landing spot hobby wise or PT job wise. For me the best part is more family time and sleeping in a bit after getting up at 6:30am for 31 yrs. I don't miss the Seattle are commute either or going to Costco on a Wednesday at 2pm. Ha. Cheers!
57 now ER'd at 55 (Megacorp 31 yrs). Still figuring out *retirement*. Company pension and 70/30 asset mix. New to the ER game....