The one thing I’ll always hold my head up high about is that 32 years later, it’s been quite a ride – it’s been a pretty pure ride, a pretty honest ride, a pretty straight ride – we haven’t done things for ulterior motives or tried to do things for commercial gains or for this or for that, so I feel pretty proud of all of it.

With family, that's the main thing. That's why you do things. Being a bit older and seeing my kids grow into teenagers, I'm helping them grow up in life. That's what I'm proud of - that's what I do everything for.

For a start, the sound of my voice has changed a little bit, which comes [with aging]. But whenever I listen to myself from those ages, I’m proud of myself because I was young, but there’s no music of mine that I listen to and I’m like, “Nah, I wish I didn’t do that.” Everything that I’ve listened to so far, I’m proud of what I did, even at that age.

The way I see it, there were two great triumphs, two things that I'm proudest of. One is the economic recovery, in which the people of America created -- and filled -- 19 million new jobs. The other is the recovery of our morale. America is respected again in the world and looked to for leadership.

My last piece of advice is the one I could have used the most. It took me a long time to learn. And it is this: You are not a slacker if you cut yourself some slack. When I was your age, I didn't believe in vacations. I didn't believe in weekends. I pushed everyone around me to work very long hours. In the early days of Microsoft, my office overlooked the parking lot—and I would keep track of who was leaving early and staying late. But as I got older—and especially once I became a father—I realized there is more to life than work. Don't wait as long as I did to learn this lesson.

I read Stephen Pinker's The Better Angels of Our Nature a few years ago and got to talk to him about it after, which was a lot of fun. I reviewed it for my blog, Gates Notes, because I wanted other people to read it, love it, and hopefully learn from it the way I did. It's probably my favorite book and the one I recommend most often.