The great secret that all old people share is that you really haven't changed in seventy or eighty years. Your body changes, but you don't change at all.
I hope that in this year to come, you make mistakes. Because if you are making mistakes, then you are making new things, trying new things, learning, living, pushing yourself, changing yourself, changing your world. You're doing things you've never done before, and more importantly, you're doing something.