I think every single retired person that I've ever talked to says some variation of the same thing: Retirement is the best job they ever had.
I'm glad that you are also enjoying it.
I think I'm a little bit older than you based upon previous posts, and contrary to the wishes of my wife, I have chosen to not yet retire. It's not out of need. It is a voluntary decision. I will offer you my perspective as to why.
First, I kind of like what I do. I find it interesting. Like any other person, I have good days and bad. But it's obviously not something that I dread.
I also look at it like this. We, as the human race, live on a planet where generally speaking, I think we have a much, much higher standard of living than humans living 200 years ago had. And I like that. I like that I have indoor plumbing and electricity and medicine that helps me get well and a car that takes me from place to place, instead of a horse.
I believe that bettering that standard of living requires the labor of humans. Yes, we need scientists and doctors and engineers to design these products or invent these medicines, but we also need the rest of us to see that food is grown to feed those engineers and scientists, and clothing is manufactured to cloth them, etc... It's all sort of a collective effort, and we each do our own little part, whether it's finding a cure for cancer, or babysitting the children of the cancer scientist.
I've been blessed with good health and my mind has not yet left me (as far as I can tell). I'm not going to try to fool anyone into thinking that my contribution would be missed, but I'm still capable of grabbing an oar and helping to pull us along, and so I do it. Others did it when I was a child and not capable of helping, and I'm sure still others will do so once I'm too feeble to be of assistance.