I actually just got the materials for SCM’s Genesis & Ancient History in the mail and have been looking them over. The course is suggested for 1st – 12th grade for the general materials, with extra book recommendations for older kids in different age groups.
While I certainly haven’t read it cover to cover yet, the portions of “Ancient Egypt and Her Neighbors” that I read looked fine for little ones. I read a sample chapter on the discovery of King Tut to my boys (ages 8 and 9) and they enjoyed it so much that they asked me to read the chapter over again as soon as I finished!
I’ve been looking through the lesson plans as well and they include suggestions for editing/adapting/skipping some lessons for younger children. It looks good to me and I’m excited about starting soon!