"I work because I feel I’m doing some good, No. 1. And, No. 2, I enjoy it. It’s not work as far as I’m concerned. I hope to be able to work as long as I’m able to, because this is what it’s all about, helping people."

-Optometrist Daniel Nast, who is 100 years old and still practicing at the Mind-Eye Institute in Northbrook, Ill., in a recent interview with the Chicago Tribune.