Adolescence is a critical period for the development of cognitive personality and maturation. Subjective well-being (SWB) levels decreases during this phase of life. Within this theme, the article investigates possible differences between the genders in the three dimensions established by subjective well-being. Each of its components, satisfaction with life, positive effect and negative effect are estimated through Exploratory Factorial Analysis. To do so, Pisa 2018 data is used and the differences between genders are measured by an Oaxaca-blinder decomposition. The estimation indicates that girls present a lower level of subjective well-being that their male peers in all three factors. These results are important to understand the gender differentials in SWB and to develop public policies for adolescents who are in school.