Iowa Code § 321.184: Applications of unmarried minors.

1. The application of an unmarried person under the age of eighteen years for a driver’s license shall contain the verified consent and confirmation of the applicant’s birthday by either parent of the applicant, the guardian of the applicant, or a person having custody of the applicant under chapter 232 or 600A. Officers and employees of the department may administer the oaths without charge.

2. The person who provided the signed consent under subsection 1 may withdraw that consent at any time. The withdrawal of consent shall be in writing, signed and verified. The department, upon receipt of the withdrawal of consent, shall cancel the applicant’s driver’s license and shall not issue a new license until such time as a new application, duly signed and verified, is made as required in this chapter. This subsection does not apply if the licensee or permittee has attained the age of eighteen years or is married.