Retired quite a few years before 65, now in early 60s. Professional engineer, worked in the construction field on schools, hospitals, university facilities, sports facilities, commercial buildings, military installations and others. Had my own consulting practice for part of the career. Enjoyed the tech. side of things, got to fly around BC often and bought an 1880s heritage building and restored it for my business (even won an award for restoring it). I do NOT miss the stress of constant project deadlines, very long hours and not being able to take proper vacations. At one point I was working full-time + overtime, going to school in evenings to get a masters degree and building a 4,000 sq. ft house on acreage entirely myself. It was ridiculous and would never, ever do that again. Love being retired and have lot's to keep me busy.
DW is a senior manager in a provincial gov't organization. She will work 2 more years until 60 so she can max. her pension benefits. She loves what she does but hates all the internal politics and can't wait to get out. It's always been on her mind that her mom died from cancer in her mid-50s and that your life can unexpectedly be cut short at any time.
One thing I've discovered about being retired is that when you are younger you look forward to all the hobbies, projects, travel and other things you'll have lots of time to finally do. However, as you get older, it takes significantly longer to get things done. Just never enough hours in a day anymore to accomplish what I want to do. Getting an RV has been one of the most exciting things we've done in year. Once DW is retired we're planning on doing a lot of RV-ing around the US.
DW and I both have a remaining parent in nursing homes. Over the past few years, we've spent a lot of time in the homes and have seen what happens to many people when they get old, many with dementia and in wheelchairs not knowing who you are or what month or year it is. It's starting to scare the carp out of me as it won't be a whole lot longer before I could be in a nursing home. It sure isn't how I want to end up and hope I just wake up dead one day in our bed at home or in our TT...