Start early. We did not get our kids accustomed to flying long distances on purpose. We lived in California; it was out of necessity. But it taught our kids to be patient travelers. The more we exposed them to the country and the world, the more they wanted to explore. And as we journeyed, we all became better people. We are more tolerant, patient, understanding and adventurous because of our travels.
Go far, not just in terms of distance. Go far outside your comfort zone. The western hemisphere is amazing. We have seen a lot of Europe and have had unbelievable adventures. But China, Jordan, Cambodia and Vietnam are different. And even though our kids are in their mid-teens to early 20's, that's just the start. We all have the travel bug.
I'm not sure how much we will be able to travel over the next decade or two. We are putting three kids through college and we are all busy. But I know that if it's possible, we will do it. As we always have, we will not be getting a larger house or nicer and newer cars. These are first-world privileges we can live without. But every penny not spent on those things will go toward seeing parts of the world that are not first-world.
Spend the time. Spend the money. Start early. Go far.