I retired at 45. Got divorced at 48, which throws a huge wrench in FIRE plans.
Fortunately, didn't burn any bridges so was able to get my old job back. Now I'm almost 52, and have a more money just for me than the joint assets I had when I retired the first time. It's really stunning how much a single upper middle class dude can save without even really trying, plus a raging bull market didn't hurt.
I could easily retire this second if I really wanted but my youngest is a junior in HS so I figure might as well work another year as it's not like I'm going to be traveling the world until he goes away to college. (Side note, your work conditions really improve when both you and your employer know you don't really need the paycheck).
Once he goes to college, I figure I'll rv around the country with my dogs for a while. When that gets boring, I'll hike the Appalachian trail, paddle the Mississippi or something else stupid like that. Or maybe 2 chicks at the same time.