The paper was based on the fact that Nigeria standard of education is falling without cogent reason. This paper investigated the effect of sex, and age of students on their performances in resent time. The data used was collected from result of Mathematics quiz competition organized by Cowbell Company across the country with focus on the result of South-Eastern part of the Country. The States considered include; Anambra, Abia, Ebonyi, Enugu and Imo States. Statistical tools adopted were; Chi-square, Correlation and regression (curve estimation). Chi-square was used to test the dependency of students’ performances on sex (Male/Female). The Chi-square test shows the performance depends on sex with p-value less than 0.05. Correlation analysis was used to determine the strength and nature of relationship between age of students and performance. The correlation value of -0.2 implies age cannot adequately explain the present state of student performance as the value was less than 0.5, though, the negative indicated inverse relationship between the variables. Curve estimation shows none of the regression approach used could adequately model the relationship between variables of interest which implies the demographic factors (age and sex) have little contribution in academic performance of students.