Youth crime involves millions of people each year, imposing extensive costs on society. This paper examines the effect of school starting age on in-school disciplinary sanctions and youth crime. Using administrative data matching education and criminal records for Queensland State secondary school students, the paper exploits school-entry administrative rules to define a regression discontinuity design. Younger pupils in cohort appear to receive more disciplinary sanctions during secondary school and to commit more crime after secondary school. A recent school-leaving age reform is also exploited to show that this crime-age profile is consistent with an incapacitation effect of school on crime
