I retired just under a year ago at age 60. Best thing I ever did. We had been saving for retirement for many years, so I didn't anticipate any financial issues, but taking that leap and quitting your job is a bit stressful. I can tell you that after one year, finances are the least of my worries.
I have not been bored in the slightest, and my stress levels are almost non-existent. I mostly putter around the house, run errands, read, and play video games, lol. I think my wife would like me to do more, but after working in a career field with insane deadline stress, I'm really enjoying not having a whole lot that I absolutely have to do.
I bought my 4BW as a retirement present to myself, specifically for the purpose of doing track days. I autocrossed and did track days quite a bit when I was younger, but stopped about 20 years ago when my kids got into their teenage years. I just finished the V Academy last week, and I plan to start doing track days after the first of the year. If you haven't taken the V Academy course, I highly recommend it. These cars are track animals and can take pretty much anything you throw at them.
We're also planning to move back to our hometown in Ohio in the next year or two. When that happens, I will be building a sim racing rig so I can get my racing fix year round. I would do it now but I just don't have room for it in my current house.