Iowa DNR Regs
From the regs:
License not required for residents under 16 if accompanied by a licensed adult (18 years or older). See page 9.
Page 9:
1a) Residents under 16 years old who
hunt under the direct supervision of their properly
licensed parent, guardian, or other competent
adult with the consent of the parent or guardian do
not need a Hunting License or pay the Habitat or
Migratory Game Bird fee. One properly licensed
adult must accompany each unlicensed hunter
under 16 years old.
1b) Residents 12 to 16 years old may hunt
without adult supervision, but must have a Hunting
License and must have passed a hunter education
course (see p. 7 for hunter education training
requirements). Fees are not required.
Persons exempted under 1a) or 1b) must
have a Deer and Wild Turkey Hunting License
to hunt deer and wild turkey.