Can you imagine reading and researching the world on your retirement? Because that's what people like him do, except they mainly focus on 10-K statements. Those are genuinely interesting to read once you learn to skip boilerplate and go for the content.

He also seems to talk to a lot of people, and he has access to pretty much anyone given his stature. Imagine being passionate about business and then being able to spend every day talking to people about their businesses and their thoughts on business. I'm surprised he retired at all!