So glad to have retired at 57, have health and energy, wayyyyy less stress. Can concentrate on fitness and nutrition, family, hobbies, etc. It has only been a year now of being retired but I can truly say that I do not miss "anything" about going to work. It was difficult at first not having the structure of work and allowing myself things like to relax in the middle of the day, or head to the gym at 9:00am, but now that I have built some structure for myself with other things it is wonderful. So, no "do over" for me.