Being 20 is not better than being 90. It's just different. At 90, I'm more aware of being alive. I'm more appreciative of my life. I'm more compassionate. I'm more patient. I'm more cognizant of what I do. Yes, at 90, it's different AND better!
My 90th birthday is here. Did I make a contribution, have a good time, live wisely, maybe accomplish something? Frankly, I don't know. I didn't find life a big performance as much as a steady marathon race.