What is happening in your teen’s brain? Want to peek inside? Healthy 17 – 21 year olds may be putting the brakes on risk-taking and applying their energy to planning ahead. Individual relationships grow in importance over the larger peer group, and attaining future goals––like getting into college or getting a job––become a priority. We’re not saying that it’s all smooth sailing; that teen brain keeps developing through their mid-20s. But you’re moving into a new stage of guidance. They’ll learn from their mistakes and get experience with decision-making, all within the safe boundaries you provide.