The SWLS is generally known to be statistically useful for assessing life satisfaction within a given demographic group, such as people of a single nationality or in a specific age range.

The SWLS is generally known to be statistically useful for assessing life satisfaction within a given demographic group, such as people of a single nationality or in a specific age range.

Age is just a number — and maybe an indicator ... by Gallup in partnership with other organizations, the trajectory of satisfaction for some young people in North America might look less like ...

The age range of the participants was from 22 to 105 years. The researchers found that lifelong singles showed lower levels of life satisfaction compared to those who were in relationships.