Youth remain severely underrepresented in democratic political institutions worldwide, despite constituting one third of the voting-age population. This underrepresentation is often linked to declining political trust among young people. This study investigates whether higher youth representation in parliaments influences levels of political trust among young people. Based on existing literature we put forward two hypotheses: (1) that higher youth representation increases youth trust in parliament, and (2) that higher youth representation reduces the age gap in trust between youth and older cohorts. To test these hypotheses, we use an original dataset combining World Values Survey (WVS) data on trust in parliament with youth representation data from the Worldwide Age Representation in Parliaments (WARP) dataset. Our dataset includes 65 countries and 129 distinct parliaments. Our multivariate regression models show no significant relationship between youth representation and absolute levels of trust among young people. However, there is partial support for our second hypothesis: higher youth representation is associated with a smaller trust in parliament age gap between youth and middle-aged groups. The findings suggest that while descriptive representation of young people may contribute to narrowing age gaps in trust, the levels of youth representation observed remain too low to see an impact, youth representation may need to reach a critical mass before any real influences can occur. Further research is needed to identify the contextual factors and thresholds necessary for youth representation to meaningfully impact political trust.