A large literature documents that there are significant academic and non-academic differences between the youngest and oldest students in a school cohort. This paper investigates if being the youngest in a cohort has any impact on an individual's propensity to commit crime by utilizing a data set that contains over 4 million arrest records spanning a 20-year period in California. While I find no persistent effect on the probability of arrest, the youngest students in a cohort have a higher risk of arrest for certain offenses at age 14, corresponding to the age when they would transition to high school.