7 Things Remarkably Happy People Do Often by Jeff Haden.
Happiness: everyone wants it, yet relatively few seem to get enough of it, especially those in their early forties. (I’m no psychologist, but that’s probably about when many of us start thinking, “Wait; is this all there is?”)
Good news and bad news: unfortunately, approximately 50 percent of your happiness, your “happiness set-point,” is determined by personality traits that are largely hereditary. Half of how happy you feel is basically outside your control.
But, that means 50 percent of your level of happiness is totally within your control: relationships, health, career, etc. So even if you’re genetically disposed to be somewhat gloomy, you can still do things to make yourself a lot happier.