From the Iowa Hunter Safety Program
"A person who is 11 years old or older may enroll in a course, but those who are 11 and successfully complete the course shall be issued a certificate which becomes valid on that person's 12th birthday. Iowa residents under the age of 12 can be issued a deer or turkey license; however, a licensed adult hunter must accompany each youth hunter. If the certificate is lost, a replacement certificate may be obtained from any ELSI vendor during regular business hours for $4.50."
Looks like it is a useless piece of paper until you are 12 or hunting deer or turkey in Iowa.