Most applicants who are age 1617 must apply in person using Form DS11. Passports for applicants 16 and older are valid for 10 years.Gov for more information. •. Most children must appear in person at a passport acceptance facility to apply for a passport. The cost will vary depending on the child's age. Step 1: Complete the form DS-11 . Complete the form online, and then print it. How Do I Apply for My Passport at the Clerk's Office? 8103 Sandy Spring Road Laurel, Maryland 20707 301-725-5300 ext. 2193 Office Hours: By appointment only Monday through Friday am to pm.