DD had to show her license when she took the Segway tour last year, a few months after her 16th birthday. They also wanted a parent or guardian to sign the release form. As I had dropped DD at the door of Epcot to get her tour and then taken younger DD to our resort, she (DD16) signed her own release form - not exactly kosher but it would have meant missing the tour if she had fessed up!! No one checked to see that an adult signed the release, but they did ask to see her ID before they gave her the paperwork.