I think having groups of younger kids exposed to art is very important. It teaches them to make it a part of their every day life. I think of it as teaching them to be cultural consumers.
This past Wednesday I hosted the World School from Nashua, NH. I had about 20 4-year olds in the gallery along with 8 adult chaperons. They were a fabulous little group of well behaved children- my favorite kind! I think they may have been overwhelmed by the experience but it may come back to them at a later date as having been a fun day. They really focused on the "why you shouldn't touch" speech I had given them earlier and had many questions on my reaction if one of them damaged a piece.
Hands down the most admired item in the whole gallery was my dog Henry. This is a picture of Amanda helping a young boy admire him. They tended to want to crowd in and lay hands on him all at once. He was very patient with them but I think he was a little distressed by the hubbub.