This part of Jerry's reply says it all - People who have no outside interests or hobbies may have a very hard time adjusting to not going to work every day, while those who do have other interests and friends outside the workplace will likely do much better. And of course some people love what they do and can't imagine giving it up, while others are worn down and burned out and really need to get out for their own mental health.
Retirement is a personal thing. I started working toward retirement at 62 and now am 73 and just returned from a 1500 mile motorcycle trip over 7 days.
I am blessed with good health. I have seen so many retired/working persons who say, "one day I would like to" Don't become on of those people. One day you wake up and it's over. No, you're not dead, it's just over. Do it now while you are healthy and able to do things unassisted.
There is nothing wrong with continuing to work if that's what you enjoy. But, don't kid your self, you can't still do it better than someone half your age. Not true in any endeavor. Including motorcycle riding.
JMO.