How do you renew my under 16 years old passport?

To renew a passport for someone under 16, you typically need to complete a passport application form (DS-11 in the U.S.), gather required documents such as proof of citizenship and parental consent, and provide a recent passport photo. Both parents or guardians must be present to sign the application if both are available. After compiling the necessary documents, you can submit the application in person at a designated passport acceptance facility or a passport agency. Be sure to check the specific requirements and processing times on the official government website for your country, as they may vary.