The graph in the US looks like "oh I hit 66, now I can retire, yay!". Just taking a guess here but if you happened to be 25 with enough money to retire for lif

The graph in the US looks like "oh I hit 66, now I can retire, yay!". Just taking a guess here but if you happened to be 25 with enough money to retire for life, you would have an even higher happiness rating since you achieved financial independence with your whole life ahead of you. I'm almost done with my 30s and I don't feel that much different than my 20s. If anything I cared less about things as a teenager. As you get older you tend to have more things to think and worry about.