We all have our own ways of measuring success in life and work. For Microsoft co-founder Bill Gates, he asks himself a set of questions that, he says, "would have been laughable to me when I was 25."
Now 64, Gates says those questions are "much more meaningful." One of them should be a metric for anyone who is pursuing success: "Did I learn enough new things?"
Gates has maintained an incredible appetite for learning new things over the years. In an interview with The New York Times, Gates said he reads up to 50 books each year: "It's one of the chief ways that I learn, and has been since I was a kid."