We present evidence of a positive relationship between school starting age and children's cognitive development from ages 6 to 18 using a fuzzy regression discontinuity design and large-scale population-level birth and school data from the state of Florida. We estimate effects of being old for grade (being born in September vs. August) that are…

This study tested hypotheses regarding the relation of differences in kindergarten entry and rentention that relate to gender and ethnicity. Hypotheses were: (1) the age at which children enter kindergarten would vary as a function of their gender and ethnicity; (2) children who were held out of kindergarten would be in the younger part of their…