In January I told my boss that I was retiring at the end of April (just as I turn 56). It is not public news yet at my place of employment but things are so much easier now. Knowing that I can leave any time just removes all stress. He has asked me to stay on indefinitely for one day per week doing only the things that I like. It is an extremely appealing offer and one that I will likely take.
I hope you can tell them where to stick it when the time comes, at 62 Y.O. you deserve freedom and no criticism! You sound like you are really on top of your investments, so I'm sure you can do it.