ID is not required for children, but since we take our grandson with us occassionally to WDW, we got him his own ID at the DMV. It only cost $5 and it's great. He loves putting his ID on the ticket counter when the airlines ask for ID, plus we like him having his ID with him. He's had his own since we was 6. He's 9 now, along with having an ID through DMV, they also have his finger print on file and a eye scan. He travels with us a couple of times a year so we thought it a good thing, especially since he has a different last name than ours.