[See: Most Relaxing Beaches]
Average Life Expectancy: 82.50 years
Several factors may explain why Andorrans outlive residents of other countries. First, this tiny nation, sandwiched between France and Spain in the Pyrenees mountains, promotes an active, outdoor lifestyle. Residents have easy access to hiking trails and ski resorts, while clean and well-maintained parks are often used for friendly games of soccer and rugby. Its citizens spend lots of time outside, which experts say can lower stress levels and consequently, cardiovascular problems like high blood pressure. Secondly, the CIA states that 100 percent of Andorra's population is educated. High education levels account for Andorra's extremely low unemployment rate. This means most Andorrans can afford high-quality nutrition and healthcare.
5. San Marino
Average Life Expectancy: 83.07 years
Europe's third smallest state—behind Vatican City and Monaco—and the world's oldest republic has a life expectancy that trumps the United States by 4.5 years. Money plays a major role here, as it does in both Guernsey and Andorra, but another key ingredient could be the nation's work environment. This enclave on the Italian peninsula didn't rake in its riches through manual labor. San Marino's primary industries are banking and tourism, with the majority of the Sammarinese working in office settings. This drastically reduces the number of work-related deaths—a big problem elsewhere.
Average Life Expectancy: 83.75 years
A sound diet and a clean environment contribute to the longevity exhibited by the population of this fast-paced city-state, located on the southern edge of the Malay Peninsula. Like in Hong Kong, Singapore's cuisine centers on rice and vegetables, which are rich in nutrients that help keep residents healthy and active. Singapore's government also enforces a strict code of cleanliness—such as heavily restricted smoking areas—to ensure that all residents live in healthy surroundings. Interestingly, back in the 1980s, the government recognized that the nation's population was aging steadily, and with careful planning, Singapore now features excellent healthcare facilities and programs for the elderly.
Average Life Expectancy: 83.91 years
Japan boasts an impressive obesity rate: 3.1 percent compared with 33.9 percent in the United States. Much of the credit is owed to the Japanese diet, which revolves around fresh vegetables, rice, and most importantly, fish. Fresh fish is a rich source of omega-3 fatty acids, which promote healthy blood pressure levels and reduce the risk of strokes and heart attacks. In addition, omega-3 fatty acids encourage healthy brain function, helping prevent diseases like Alzheimer's. The Japanese also make healthier lifestyle choices: They tend to walk more and not overeat.
Average Life Expectancy: 84.43 years
Like several other nations on this list, Macau can attribute its high life expectancy, at least somewhat, to its fruitful economy. But why this tiny nation in the South China Sea is so prosperous might surprise you: Gambling is its main source of revenue, and 70 percent of the money generated on the casino floor is reportedly invested by the Macau government in public healthcare. The island boasts a variety of casinos, many of which are owned by the same bigwigs who gave Las Vegas its "Sin City" reputation. In January 2012, Macau welcomed 2,461,640 visitors looking to test Lady Luck.
Average Life Expectancy: 89.68 years