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Unhappiness and age
"I examine the relationship between unhappiness and age using data from eight well-being data files on nearly 14 million respondents across forty European countries and the United States and 168 countries from the Gallup World Poll. […] Unhappiness is hill-shaped in age and the average age where the maximum occurs is 49 with or without controls."
By David G.Blanchflower
https://www.sciencedirect.com/science/article/pii/S0167268120301414