That's for a Junior mentored tag/license combo I believe. If your son has a full priced adult hunting license, you will not have to have a license. Or, he gets the junior tag, and you get a 3 day license for small game or maybe the "non-game" $39 license. But I would check with f and g.
"Nonresident youth ages 10 to 17, who possess a nonresident junior mentored hunting license, must be accompanied by a licensed adult 18 years of age or older and be close enough to be within normal conversation or hearing range without shouting or the aid of electronic devices. The licensed adult must have a current year tag which is valid for the same species, and may hunt while participating in the mentored hunting program. The licensed adult may not accompany more than two youth at a time. A tag that has already been filled still meets the tag possession requirement.
• Nonresident youth ages 12 to 17, who possess a full price hunting license are not required to follow the “accompanied by” rule in the field."