I retired at 29 accidentally, and thankfully.
I was planning on working a few more years to build up a bigger pile of assets, but then the place I worked changed ownership and I wasn't thrilled with the new owner, so I reluctantly decided to just stop working and go with a lower spending rate retirement plan.
Turns out I don't actually need a bigger pile to live a great life and working a few more years at a job I really didn't like would have sucked, so actually the ownership change was great timing. I probably would have kept working just one more year or two until I had more money, and then just one more year after that just in case, and maybe just one more year after that, and probably just one more for good measure... It's really hard to unplug.