I have had to show proof for my kids friends when they would come with us & that was at the ages of 13-16. They were asked for ID & we showed their middle school ID. All middle & high schoolers have a pic ID. I would take it with me if I were you. Better safe than sorry. I never had to showed for my kids. We started getting the seasonal pass when they were all considered children. I haven't renewed my 18 & 16yr old in 2 years now. I would imagine that my 16yr old would have to show & I know my 18yr old would. By the way, in the state of Fl, they can get their driver's permit at the age of 15, so the licence bit isn't a good excuse.