Your U.S passport can only be renewed if ALL of the following conditions are met:
You still have your U.S. Passport in your possession.
Your previous U.S. Passport was issued when you were age 16 or over.
Your previous U.S. Passport was issued no more than 15 years ago.
Your current U.S. Passport is undamaged.
Another condition for having an existing passport renewed is that it must not have been issued while you were under the age of 16 years old. Passports that are issued to minors are not the same as those for adults and cannot be renewed as of such. Your current passport must have also been issued within the last 15 years. Those that are older than that will need to be replaced with a first time U.S. passport as though they have never had a previous passport. Finally, the passport must not be damaged.
If your current passport meets all of these requirements and the expiration date is not for six months longer than the extent of your planned travel, you will need to apply for an adult passport renewal services.