Freedom!!! I have always ran my own business and the day I sold it and locked the doors for the last time. I whooped!!!
Every day is whatever I want it to be, I can book a flight and "take-off" if I want, or as I've been doing recently, sitting on a lounger, under my umbrella, reading in the afternoons. A delicious feeling when everyone else is hard at work.
Also, one of the best things about being older is Grandchildren, I've had the pleasure of looking after all mine while daughter went back to work part-time. As the jokey saying goes, "Grandchildren are so great, if I'd known, I would have had them first".