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…

Much interest exists among parents and researchers regarding the benefits and drawbacks of delaying kindergarten entrance to acquire academic advantage ("redshirting"). How evident is this assumed advantage at the kindergarten level and beyond? The authors evaluated large-scale test data from Grades K-8 to investigate the difference in performance…