I just finished playing a 3 level dungeon of ToD with my kids (6 and 7 years old.) They had a great time and said things like "we should get up really early tomorrow and play this again!" :-) They loved the whole aspect of the game and it is fun to see them enjoy it.
I was that age when I was sneaking into the den at 2 AM to play it while my parents were asleep... Crawling the dungeons---afraid of the demons and flying "creepies", but also equally as scared of my parents walking in and saying "WHAT THE HELL ARE YOU DOING AWAKE?!??!". Which they did many times.