I'm 7,751 days into retirement. Things didn't even start to "slow down" until at least 2 years into it. The first 2 years were spent trying to complete the "Honey Do" list. Once I figured out that would never happen I slowed the pace a bit. There was no guilt involved at any time. The wife and I had both decided we were going to retire at 55. She did retire so to speak, but spent another year taking care of her ailing father. When he passed things did slow down for a brief moment, but then we had more time to do some of the things we wanted to do.
When the company offered me a buyout at 57 I was all in. It was a bit of a strange deal though. I "retired" on a Friday, and the phone was ringing off the hook Monday asking if I would like to come back as a contractor. It took over 6 months to convince them I really wanted to stay retired.
During our retirement we've managed to stay more than busy. Between all the things that need getting done at home we've managed to put over 150,000 miles on 2 different motorhomes. In that time we've been to Alaska 3 times, covered a good share of Canada, and nearly all the lower 48. Last year was the exception. The motorhome didn't move between October of 2019 and September of 2020. Our next trip will be in a couple weeks.
Now that I've reached 72 things are starting to slow down. That doesn't mean there's less to do, it simply means it takes me more time to do the same things.