But do not stop. You will, if you have taken care of yourself, live another thirty years after you leave your regular line of work. That is a long time. I know, at age forty, the idea of never heading off to the job again, trading the day of labor for the day of leisure, is so tempting. But mostly unrealistic.
Inactivity has enormous downside risk.
Alzheimer's has been proven to come on early, as much as ten years earlier, in an inactive brain. So plan not to throw out that magical target date. It shouldn't be rocking away on the front porch waiting for the end. You should plan on easing the pace. Pursuing a hobby.