Psychological well-being has been linked to many important life outcomes, including career success, relationship satisfaction, and even health. But it's not clear how feelings of well-being change as we age, as different studies have provided evidence for various trends over time.
A new report published in Psychological Science, a journal of the Association for Psychological Science, reveals that self-reported feelings of well-being tend to increase with age, but that a person's overall level of well-being depends on when he or she was born.
Psychological scientist Angelina R. Sutin of Florida State University College of Medicine conducted the study while at the National Institute on Aging (NIA) at the National Institutes of Health (NIH), where she remains a guest researcher. She and colleagues at NIA predicted that people in the same "birth cohort" - born around the same time - may have had unique experiences that shape the way they evaluate happiness and optimism. They hypothesized that the level of well-being a person reports would, therefore, vary according to his or her birth year.
Using two large-scale longitudinal studies, NIH's Baltimore Longitudinal Study of Aging (BLSA) and the CDC's National Health and Nutrition Examination Survey (NHANES), Sutin and colleagues looked at data from several thousand people over 30 years, including over 10,000 reports on well-being, health, and other factors.
When the researchers analyzed the data across the whole pool of participants, older adults had lower levels of well-being than younger and middle-aged adults.
But when Sutin and her colleagues analyzed the same data while taking birth cohort into account, a different trend appeared: Life satisfaction increased over the participants' lifetimes. This trend remained even after factors like health, medication, sex, ethnicity, and education were taken into account.
So what explains the different results?