The U.S. hit an all-time low ranking in the annual World Happiness Report, tumbling eight spots to 23rd.
Why it matters: Some countries, like Finland and Denmark, consistently rank among the world's happiest. The U.S. isn't one of them.
The big picture: A steady supply of studies has found that Americans feel glum about issues ranging from loneliness to the economy and the country's political leadership.
It's the first time since the report launched 12 years ago that the U.S. did not rank among the world's 20 happiest countries.
Between the lines: Gallup, whose data powers theWorld Happiness Report, pointed to "Americans under 30 feeling worse about their lives" for the steep drop.
Today's young people report feeling less supported by friends and family, less free to make life choices, more stressed and less satisfied with their living conditions, Lara Aknin, an editor of the report, told Axios.
People under 30 today also feel less confident in government and have increased perceptions of corruption, she added.
The report also found that older people are now happier than young people in North America — the opposite of many other regions.