"Don't worry, be happy" may be more than just a wishful mantra. A new study finds that people's happiness levels can change substantially over their lifetimes, suggesting that happiness isn't predetermined by genes or personality.
Psychologists have long argued that people have a "set point" for happiness. Regardless of what life brings, the set-point theory goes, happiness levels tend to be stable. A big life event could create a boost of joy or a crush of sorrow, but within a few years, people return to a predetermined level of life satisfaction, according to the theory.
The new study, which used a nationally representative sample of almost 150,000 German adults, finds the opposite. People's long-term life satisfaction can change, the researchers report today (Oct. 4) in the online early edition of the Proceedings of the National Academy of Sciences. In fact, a substantial number of people followed over 25 years saw their happiness levels shift by one-third or more.
The study also echoed previous happiness research in finding that money doesn't buy happiness.
"People with a lot of money are more satisfied with their lives... but mainly due to the more interesting and challenging jobs they have," study author Gert Wagner, a researcher at the Max Planck Institute for Human Development in Germany, told LiveScience. "Money is simply a byproduct of good and satisfying jobs. If you want to be satisfied with your life, you must spend time with your friends and your family."
Wagner said that previous work suggests findings on happiness from one developed country, like Germany, should also hold true for another, such as the United States. In fact, a study in May found that in the United States, happiness tends to increase with age.
I'm happier than you
The researchers used data from a study of German adults spanning from 1984 to 2008. Each year, the participants answered questions on their life satisfaction, life goals and other measures like how much they exercise and socialize.
By averaging life-satisfaction responses to even out any short-term effects, the researchers plotted out the respondents' happiness by percentiles. Someone in the 99th percentile, for example, would be happier than 99 percent of the study participants.
People shifted in the rankings — and thus in their levels of happiness — quite a bit. Just over 38 percent changed their position in the distribution by 25 percentiles or more during the study period. About 25 percent changed by 33.3 percentiles or more, and 11.8 percent changed by 50 percentiles.",...
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"People can hate on you for doing what it is that makes you happy, but ultimately, it has to belong to you. It shouldn't matter what anyone else thinks. Life is not easy. The road to happiness is not a path well trotted. You have to find your own path to enlightenment."