Objective – The objective of our study was to quantify the importance of the effect of age, gender, school level and region on psychological performance (Determination, self-confidence, positive awareness and visualization) in a population of young footballers enrolled in Tunisia aged 13 to 18 years. Methods - Psychological Performance Inventory - Alternative Arabic version (PPI-AA), questionnaire validated in a previous study, (Golby et al., 2007; Walha & Elloumi, 2025) composed of 14 items, it measures four dimensions of psychological performance: determination, self-confidence, positive awareness and visualization. The questionnaire uses a 5-level Likert scale, facilitating the differential analysis of scores according to individual profiles, was evaluated in 255 sports students between December 2024 and March 2025. The scores of the PPI-AA, used, adopts a more advanced modeling approach, by mobilizing a system of simultaneous equations estimated by the TMCO model (Triple Least Ordinary Square). Comparison tests (Student's t) to evaluate the differences in scores according to the explanatory variables. Results - The main results of this study show i) for a sporting activity such as football a curvilinear decline in psychological performance as a function of age ii) a significant difference between the sexes with a decline in psychological performance earlier in girls and no significant differences for the other variables. Conclusion – Age, gender, school level and region of belonging appear to be associated with psychological performance in the Tunisian context. Psychological performance is a process whose dimensions are correlated and not an event in footballers. Age, gender, school level and region of belonging appear to be associated with psychological performance in the Tunisian context.