All I have retired from (which I did 6 years ago) is full-time work which I was good at but my heart wasn't entirely in, that made me more than a sufficiency of money - but which, on the other hand, limited my opportunity of doing all the things I love to do. Those things, I now do full time. You need to make time to be doing those things all through your life, because you might drop dead at any moment, and it's good practice for when you do have nothing else to do.
Mrs Badger (who retired much earlier, because she could) and I had also planned to go and live somewhere pleasanter than where we used to have to. We did some future-proofing about that: this is a part of the country where people often retire to from big cities, attracted by much lower property prices - but when you move out to the country, you have to accept that all the services and facilities you got used to in the city, are much reduced out there - so how's the public transport system for when/if you can't drive any more? What's the access to healthcare services like? (etc). Are you still within reach of friends and family? How good are you at establishing new social networks (assuming you need them)? We spent years looking around, seeing what places were like in the winter, how community-oriented, how socially active, such places were, before choosing our relocation.
In UK, a lot of people's personal wealth is tied up in their home: if you ever needed to downsize or go into a care home, how buoyant are property prices should you need to sell up?
If (as preppers are fond of saying) the manure coincides with the air-conditioning (SHTF), have you the resources to grow/hunt/fish your own food? Would you be on a main exodus route for hundreds of thousands of desperate city-dwellers if/when urban infrastructures collapse? How vulnerable to worst-case scenarios is your wealth? What if your externally-provided power supplies fail?
I know, one can reasonably only anticipate so much, and Mrs B and I are old enough to have lost a few friends to whom shit happened that no one could reasonably have foreseen - so above all, I'd say, one needs a robust philosophy to carry you more or less sane through really bad times - and just pray it won't ever be too severely tested.
Oh, and keep on making new friends - because the longer you live, the more your existing stock is likely to diminish.
Those are my thoughts, for what they're worth.
