When I was young, I was stronger and prettier but not very wise. Sure, I did well at university but outside of class I sure did some brain-dead, stupid, dumb things! (thinking of the 1960's..... yeah, OMG, for sure).
I think that as I grew older, I got a little more savvy in the ways of the world and gained a little wisdom; I think I have lots better judgment now. I also learned how to be happy. For me that was a learned skill and one well worth developing.
Even though I think I was much prettier when I was young, I didn't *know* that at the time so I didn't get any enjoyment out of it. I'd look in the mirror and think I was ugly. So, that wasn't an advantage.
I'm not as strong as I was back then, but there are helpful devices and people that can assist me.
My metabolism was amazing and I could eat like a horse and not gain - - but back then my finances wouldn't allow me to buy enough food, so I was always hungry. I am still always hungry but now it's because I have to cut back on calories.
All in all, I am enjoying my old age a lot. The only damper on that enjoyment is knowing that we all have an expiration date, outliving those dear to me, and knowing that one of these days the end will come for me as well.