How do you address envelope to 16 year old boy?

To address an envelope to a 16-year-old boy, write the recipient's name on the first line, followed by their street address on the second line. Include the city, state, and ZIP code on the third line. If needed, you can add a title like "Mr." before the name, but it's typically not necessary for a teenager. For example:
John Smith
123 Main St
Anytown, ST 12345