The Well-Being Gap Between Liberals and Conservatives
americanaffairsjournal.org
americanaffairsjournal.org
It's a US-only phenomenon. In Europe, liberalism means something roughly closer to "small-government libertarian". It meant that in the US, too, up to the early 20th century.
Then it got associated with a reform movement that was not as radical as the progressive movement, which promoted very active government. It became contrasted with conservatism, which meant "avoid socialism at all costs" in the United States.
That's still more or less what the terms mean, but none of them have precise definitions. They're kinda-vaguely useful in a study like this, which is deliberately drawing really broad generalizations. Whether it's conclusions are useful, I can't really say.
Seems to be about teens as opposed to everyone
Generally, Conservatives ideologies (by nature) lean toward conformism, and being happy is a type of conformism.
Looking at natural experiment representations of happiness (like obesity/compulsive eating, alcohol abuse, etc.), the narrative is much less clear
EDIT: Even moreso, at a global level, liberalism appears to be huge positive indicator of self-reported happiness [0], so take this with a grain of salt.
You may want to test whether you're trapped in a confirmation bias bubble, as sounds likely.
Each group, conservatives and liberals, tends to feel the other group has "less coherent philosophies and understanding about how the world works" than their own group.
https://en.wikipedia.org/wiki/The_Paradox_of_Choice
* I'm exaggerating a bit of course.