Obviously this is one man's opinion.

I remember my friend interviewed at a company and the interviewers would end the interview with "do you have any questions for me?"

I asked, "What did you ask? did you ask if they liked working there?"

"No, I tried that a long time ago, and nobody ever says they don't like working there - it is a self-selecting population - everyone is always where they choose to be"

I've found exactly the same things talking to people on both sides of the retirement question.

People who have retired think everyone should retire.

People who have not retired stand by their decision too.

(also, lots of people who retire die in a few short years - correlation or causation?)

Actually I know one person who wasn't happy. He retired because his wife nagged him to do it and he tells me of his regret.