I also retired this year, but I am ten years older. I retired from my full professor position in energy at a university and I am now spending my time in corona isolation with my wife and our 8 dogs, horses, 50 sheep and 2 cows (and a glass wine on accasions!). I never now wear a watch and can do what I like. I do some consulting for people I like, but I try not to fill my time with projects I do not like.
My only regret is that I did not retire at your age, there are so much I still want to do outside university and so little time left. The last years at work was like a long wait for freedom.
Enjoy your retirement and do not look back! The years go much more quickly as you become older, use your retirement well!