From the blog of Rebbetzin Hurwitz:
Many years ago, in a small European village, lived an elderly Rabbi.
He said,
“When I was in my twenties, I thought I could change the world. When I was in my thirties, I thought I could change my country. When I was in my forties, I though I could change my state. When I was in my fifties, I thought I could change my city. When I was in my sixties, I though I could change my community. When I was in my seventies, I thought, well maybe at least I can change my family. When I was in my eighties, I realized that the only one I can change is myself.
Had I realized that in my twenties, I would have changed the world."