In 2026, the rule for visiting Disney World or Disneyland alone is that you must be at least 14 years old. According to Disney's official policy, children under the age of 14 must be accompanied by a guest who is at least 14 years old to enter the theme parks or water parks. This means a 15-year-old can technically go to the park alone or even be the "responsible party" for their younger siblings. However, there are some practical hurdles for those under 18 traveling entirely without an adult: you generally cannot check into a Disney Resort hotel (which requires at least one guest to be 18+), and you may face issues with legal waivers for certain high-risk activities. While a 16-year-old can spend the whole day in Magic Kingdom with their friends, they should carry a photo ID and have a digital payment method (like Apple Pay) ready, as the "magic" of a solo trip still requires a bit of logistical adulting.