I originally posted this in the first thread by accident. Here is my response to this question...
With the exception of my 2 year old son, I've bought or given a model kit of some kind to everyone of my six children as well as a couple of their friends and to one of my nephews. I've got literally hundreds of unbuilt kits in just about every major genre (armor, aircraft, ships, cars, trucks, figures, sci-fi, monsters, helicopters, real space, etc.). Two of my children are interested in model building, one is a pretty good builder and has won several junior awards.
I have seen kids at stores want a kit that is beyond their abilities. They want it because of the subject matter or box art. If it is a subject matter that interests them, there is normally a kit within their skill range that is similar.
My daughter wanted the Tamiya Pink Panther Landrover, but I thought it was a little complicated for her. I gave her the old Monogram Jeep kit that was reissued by Revell for her to work on. Once she finished that easy to build kit, I gave her one of the Tamiya M151A2 Jeeps. A better overall kit that helped improve her skills.
After she had those two under her belt, I let her have the Pink Panther. She built it up real nice and won an award with it. She also won an award for one of the Jeeps as well.
She is 13 now and other than my 9 year old son and 16 year old son, is the only one who really tried and liked modeling. My 21 year old son and 18 year old daughter never got past trying it when they were around 8-10.