My Great-Grandpa once told me why old people shrink.
I help my Grandma plant flowers today then it started pouring so we went in and played cards to wait for it to blow over. It was nice. It reminded me of being little again with all those familiar smells of my grandparents' house. It was relaxing.
Gramps: You know why old people love rocking chairs, don't you?
me: No, why?
Gramps: momentum.