From Gallup:

Since the mid-20th century, Gallup scientists have been exploring the demands of a life well-lived. Recently, in partnership with leading economists, psychologists,
sociologists, physicians, and other
acclaimed scientists, we explored this topic in greater detail. From various in-depth analyses, including random samples from more than 150 countries, we studied the common elements that best differentiate lives spent thriving from those spent struggling or suffering. Continue Reading