My son has just turned 10, he is now allowed to stay in a car alone when we go into walmart or the grocery store. If he goes into walmart with us sometimes he will take a book and ask if he can sit on the benches outside the restrooms or outside of the pharmacy which is fine too. You know your child best and if he is happy to just sit and read a Disney book or look thru a Disney brochure then I would let him wait it out.