By them I mean anyone that you're willing to allow yourself to listen. I believe it was Ralph Waldo Emerson that said, "Every man I meet is in some way my superior."
Our ego doesn't want us to believe that statement, but it's true. We're not perfect and when we realize that, we see that we can learn so much from everyone around us.
Put your ego aside and learn from someone today. Preferably someone that you thought yesterday had nothing at all to teach you.