While the "best" age is subjective, many experts and parents agree that ages 5 to 9 represent the "sweet spot" for a first Disneyland visit. At this age, children are usually tall enough to meet the 40-inch height requirement for most "thrill" rides (like Big Thunder Mountain or Space Mountain) but are still young enough to fully believe in the "character magic." They have the stamina to walk most of the day without a stroller, yet they are still small enough to be enchanted by the parades and fireworks. For children under 5, the trip is often "for the parents," as the child may not remember the details and can be easily overwhelmed by the noise and crowds. Conversely, teenagers may find some of the traditional "storybook" elements "uncool," though they appreciate the high-tech immersive lands like Star Wars: Galaxy's Edge. If you are looking for the perfect balance of "core memories," physical capability, and genuine wonder, waiting until a child is in early elementary school ensures they get the most out of the expensive tickets and long days that characterize a Disney vacation.