As an early airline pilot “retiree” who is still working as an aviation consultant, I agree with just about everything that has been mentioned here. There are as many variations on this theme as there are people.
I believe you really have to plan for the worst and hope for the best, so we’ve put our eggs in quite a few baskets. We are in our 50’s, and are still working at things we enjoy, we have lots of investment properties, investments, and are maxed out all savings opportunities, etc., etc.
I’ve watched friends with all of the best laid retirement plans made throughout their lifetimes lose it all in one way or another. So, if one is lucky enough to make it to retirement–whenever that may be for them–and lucky enough to have the health and means to enjoy it when they get there, they should consider themselves very fortunate.