I want to stress this isn't a financial worry. It's more of how I'm going to fill the days up. Sure I have interests and hobbies but these aren't enough to fill the days 24/7. And will miss some of the people at work. But all of these issues you have to face them sooner or later, if you retire at 50 or 70.
Francis
It's been nearly three years for me, but I still see friends from work maybe once or twice a month - some have also retired, while others have another decade or so of work/saving ahead of them.
We get together for coffee, lunch, dinner parties, and some of us golf from time to time. If you're going to miss people, then maybe take steps to develop a non-work relationship?