Merry Christmas.GMorrison
I was about that age when I started didn't have the options of Klick to gether kits like revell and others ..I think some of the revell kits like the p51D whould be a good choice..there are others. Water based paints . All you have to do is teaching the responsibility of the dangers of using glues ,paints ..I'm pretty sure you got that covered in spades..
5-high