The test measures nine factors that can calculate a person's biological, rather than chronological, age.
Researchers were surprised by how much these habits appeared to boost life expectancy.
About one in five deaths around the world can be attributed to poor diet, according to a study titled "The Global Burden of Disease."
A new study shows that despite the U.S. spending more on health care than any other nation, huge inequalities persist when it comes to life expectancy.
Japan has a lot of really, really old people.
The findings come from a new study conducted by the London School of Hygiene & Tropical Medicine.