1. Which country has the longest-living citizens?

Japan. Average life expectancy in the nation is 83 years and seven months – that’s a whole three months ahead of the oldest average Swiss person. (Switzerland came second in the ranking by the World Health Organisation.) Could the Japanese concept of ‘ikigai’, a purposeful and happy life, be the cause?

2. Why will South Koreans be outliving us all by 2030?

South Koreans enjoy a healthy diet and high-quality healthcare systems. Women born in South Korea in 2030 will be the first in the world to have an average life expectancy of above 90, says a new study. Researchers believe it's all down to South Korean food, most notably kimchi, a vitamin-rich dish based on fermented vegetables. Other factors include advances in economic and social status and lower road-traffic accident rates.

3. How many years do healthy habits add to your life?

Both 14 years and 12 years are the correct answer. Adopting five healthy habits will add 14 years to your life if you’re a woman; 12 if you’re a man, according to a Harvard study. No prizes for guessing what these lifestyle changes might be: researchers say a healthy diet, regular exercise, sensible body weight, not drinking too much alcohol and not smoking could cut your chances of dying early by as much as 74%.

4. Where do women outlive men by more than a decade?

In Russia, the country with the widest life-expectancy gap, the average man lives to 64.7 years old, while the average woman makes it to 76.3. That makes it a difference of 11.6 years! At the other end of the scale, in Mali, where lifespans are 58.2 for men and 58.3 for women, the difference is only 0.1 years. There's more context in this article.

5. How much longer do religious people live?

A new Pew poll found that religious people live nearly four years longer than those with no ties to religion. Researchers suggest it's because of a mixture of social support, purposeful activities, stress-relieving practices and abstaining from unhealthy habits.

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