The ride is designed to cater for all the family, much as the Kilimanjaro Safari does in Animal Kingdom, so it will be fine for a 7-year-old. I didn't notice any height restrictions posted, although that may be because they have yet to complete the finer details.
BG also has a lot to commend it to the under-10 age group, too. As well as half a dozen or so out-and-out kiddie rides, it has the wonderfully imaginative Land of the Dragons, a purpose-built adventure playground of nets, climbs and slides. Then there is the steam train ride, cable car and sand pit dig (in Egypt), while most of the shows should appeal to children, too. And that's before you count the various animal attractions, most of which have guaranteed child appeal.
Barry - I wouldn't really compare RR to Spiderman as it is not that technologically advanced. It is more a combination of say, Kilimanjaro Safari, Dinosaur and Kali River Rapids. As such, it is unique, fascinating and a lot of fun.
PS: Still working on it, Viking!
simon.veness@virgin.net