Effect of Age on the Academic Performance of Junior Secondary Students in Osogbo Local Government, Osun State

This study investigated the effect of age on academic performance of Junior Secondary School Students in Osogbo Local Government area of Osun state. The study was expo facto research deign because 2025 BECE result was collected from documentary record of the 14 Junior Secondary Schools selected. Simple random technique was used for the sampled schools. Data collected was analyzed using mean, standard deviation and t-test inferential statistics. The result showed that: there is no significant difference between the expected age at which student gain admission into junior secondary school and their academic performance, there is significant difference between the actual age student gain admission into junior secondary school and their academic performance, there is no significant difference in the academic performance of both the younger and older students of junior secondary school, there is no significant difference in academic performance of student of different ages when compared except for ages 12 vs 14, 12 vs 15, 13 vs 14, 13 vs 16, 14 vs 16 and 15 vs 16. Recommendations were made for further studies.