Six should be fine. I think the target audience is probably 7-10, but the great thing about the Wilderness Explorers Program is that it really works well for all different ages, and the CMs seem to do a good job of adapting their spiel to the persons age and knowledge. Ive read reports of toddlers doing the badges alongside their older brothers and sisters as well as adults who find the booths a lot of fun. The activities are so varied that they really appeal to a variety of different ages and interests. Some activities are more hands on; some are more informational. Some appeal more to older kids/tweens and some to younger. Whats nice is that there are 30 badges, so if you come to one that is too difficult or doesnt interest you, you can just skip it and do a different one later. The only thing I see as possibly being an issue for a 6 year old is the reading. Some of the badges require a little reading, but you should be able to help her with that easily enough. In the end, I think it depends on your childs personality and interests more than their age. These are fun educational activities after all, and children who are interested in animals, science, or learning seem to enjoy the activities better than other children who only want to rush through to get the stickers.