This document summarizes research on adolescent sex offenders. It finds that 1/3 to 1/2 of adult sex offenders began offending during adolescence. Nearly half of juvenile sex offenders began offending before age 12. Studies show treatment programs targeting criminogenic needs like antisocial attitudes can reduce recidivism rates compared to sanctions alone. Cost-benefit analyses indicate for every $1 spent on effective juvenile programming, taxpayers save $7-31 on average due to reduced crime.