I remember George Segal chuckling at his well-meaning relatives' inquiries about when he was going to stop making sculpture and retire. As my son Adam, who was about 10 at the time, noted, "Many people retire so they can make art." Here’s Steve Jobs, when asked if the introduction of the iPad might be a “high, fitting end” to his career:

“I don’t think of my life as a career. I do stuff, I respond to stuff. That’s not a career—it’s a life.”

Complete interview, Time Magazine, April 12, 2010.