Studies show that gender socialisation shapes differently the gendered identity, self-esteem, and sexual behaviours of girls and boys. While pre-adolescence is viewed as a pivotal period for gendered socialisation, few studies in francophone Africa investigate the role of gender identity effects on aspirations and sexual and reproductive behaviours at this life stage. This article explores how the internalisation of gender stereotypes during socialisation is linked to the aspirations of girls and boys for certain life events, such as having their first child or getting married. A survey was conducted in 10 primary schools in Ouagadougou, among pupils aged between 9 and 16 years, as well as seven focus group discussions with their parents. The findings indicate a gender-based variation in the effects of adherence to unequal gender norms among young adolescents. As a result, girls tend to have earlier aspirations towards marriage and later aspirations for childbearing, while boys show earlier aspirations for childbearing and later ones for marriage. These effects may expose both girls and boys to risks of poor sexual and reproductive health. Interventions promoting egalitarian gender norms could boost girls' self-esteem as well as mutual respect among young adolescents of both genders, aiming to improve their sexual and reproductive health during adolescence and into adulthood.