We present evidence of a positive relationship between school starting age and children's cognitive development from age 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 versus August) that are…

In the United States of America, the practice of kindergarten redshirting i.e., of waiting to enroll a child into kindergarten until the year after the child was originally eligible, is becoming more common in today's schools. This study offers insight into the reasons why some parents elect to redshirt their child at the kindergarten level. A…