All this week, we are talking about how you can continue to get smarter, no matter how old you are. It's called neuroplasticity—the idea that our brains are still changing, no matter what our age is, and if we do things right, we can create new connections, new synapses in our brain, and actually get smarter. I'll give you one way to do that right after this.

It's time to get lean, healthy, and save America. One great way to continue to get smarter, no matter how old you are, is to spend time with people of different generations, particularly much younger people. If you can talk to someone 30 or 40 years younger than you, I promise you will be blown away by the way they think. I have two kids in their 20s, and every time I talk to them, my brain gets smarter because I'm exposed to their crazy ideas.