The goals of this study are: (1) to know the differences in age and gender-related motivations, and (2) to check if there are differences in the reasons based on state-trait anger levels. An ad-hoc questionnaire was developed, and the State-Trait Anger Expression Inventory (STAXI-2) was applied to 1188 children sports fans from Spain. Results showed that girls chose social and family reasons. On the other hand, boys stand out for their choice of antisocial motives, watching their idols, and the competitive motive. Regression analyses showed that lower levels of trait anger are related with not to choose the motives "I enjoy seeing how they shout and insult" (p<.01; OR=.87), "because it relaxes and calms me" (p<.01; OR=.84) and "I like the fuss they make" (p<.01; OR=.89). Furthermore, regression analysis showed that lower levels of anger state are related with not to choose the reason "to be with my friends" (p<.01; OR=.87), "because they shout and insult" (p<.01; OR=.82), "my team is winning" (p<.01; OR=.95), "I like the fuss" (p<.01, OR=.82); and the reason for joining a supporters' club is " I like the fuss they make" (p<.01; OR=.49). It was concluded that there are differences in gender and age depending on the chosen motifs. In addition, state-trait anger influences the motives chosen by young sports spectators, with youths with higher levels of trait-state anger exercising for the more competitive and unsportsmanlike reasons.