Retired at 55 when my employer failed to live up to their promises in a time of change... And took a package involving some cash and a 5 year jump on my pension. I took a year off, fixed up and sold my house, moved 100 miles west to my family farm, started a new house and got a job doing stuff I really liked - tho for less money. I took a second retirement 8 years later, but now work as a free lancer, and just enjoy being a grandfather, land and tractor owner, and learning new things. I was never sorry I retired, and may go get another job some day just for the heck of it. As long as I'm looking down on the grass from above, there are endless possibilities.
As long as you have interests, other work or family to keep you busy - and you can swing it financially - retire as early as possible... And as often as you like. As others have indicated, doing nothing will bring on early death - or irrelevancy.