I know that most guides tend to talk over the heads of children, especially if they are young but kids can enjoy Ancient Egypt to. I first brought my daughter here when she was 8 and by doing our tours on donkey rather than in a boring old taxi she found it a fun holiday.
I try and make my children's tours fun by dressing up and take advantage of the quietness of the temple of Seti I by acting out Pharaoh at the window of appearances. The guards are very good natured about helping me and joining in and the faces of the local children watching us had to be seen to believe.