Travelers throughout history searched for a mythical spring with healing waters that promised everlasting life. Although a true Fountain of Youth remains to be found, people today live longer than ever.

Common sense says that the more developed the economy, the better chances it has for longer life expectancy with access to a high level of healthcare. Plus, a healthy diet never hurts. [Read more about the happiest countries in the world.]

The UN relied on longevity around the world as one factor to weigh into rankings of the happiest countries in its latest report. Here are some secrets travelers can learn from the countries where people live the longest.