I think if you are 65 and you like what you do, why not keep doing it, unless it is preventing you from doing something you really like.
Also, I think turning off the tap is kind of scary for some people. If you're a professional and can consult, still make money and work 6-7 months year, seems silly to stop because you're 65. If you are in bad health that's one thing, but I know a lot of 65 year olds who are surprisingly fit.
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