Two answers
1. Never if retirement means sitting around and not "working" on something that interests me.
2. Now if retirement means "the ability to make work decisions without having to worry about the economics of those choices."
Realistically, #2 is a long ways off. I am down to a rather busy "part time" these days at age 55. The master plan is to get Theresa to #2 this year, in her late 40s and see how that goes.
One of the big discussions we've been having is how much stuff we would or wouldn't give up in order to retire early or scale back to a part-time that basically feels like retirement.
Willing to pass on: fancy trips, fancy gear, new cars
Not willing: health insurance, healthy food, simple trips, visits to family