Researchers Belén López-Pérez and Ellie L. Wilson found: “Parents of 10- and 11-year-olds significantly overestimated children’s happiness, supporting previous literature on the parents’ positivity bias effect. However, parents of 15- and 16-year-olds showed the reverse pattern by underestimating adolescents’ happiness. Furthermore, parents’ self-reported happiness or well-being (reported 6 months later) significantly correlated with their estimations of children’s and adolescents’ happiness. Therefore, these results suggest a potential parents’ “egocentric bias” when estimating their children’s happiness.”