Iowa Code § 468.513: Vote of minor or person under legal incompetency.

The vote of any person who is a minor or under legal incompetency shall be cast by the parent, guardian, or other legal representative of the person. The person casting the vote shall deliver to the judges and clerks of election a written sworn statement giving the name, age, and place of residence of the minor or person under legal incompetency, and any false statement knowingly made to secure permission to cast such vote shall render the party so making it guilty of the crime of perjury.