No, in 2026, an 18-year-old cannot legally drink alcohol on Castaway Cay, Disney’s private island in the Bahamas. Although the legal drinking age in the Bahamas is 18, Disney Cruise Line (DCL) maintains a strict 21-and-over policy for all alcohol consumption, regardless of whether the ship is at sea or docked at their private island. This policy ensures a consistent "family-friendly" environment across the entire Disney experience. The only rare exception to this "21" rule on a Disney Cruise occurs on specific European itineraries departing from countries where the drinking age is lower; in those cases, a parent or guardian can sign a "waiver" for a 18-20 year old to consume beer or wine onboard the ship only. However, this waiver does not apply to Castaway Cay. For the 2026 traveler, this means that while your 18-year-old can enjoy the "Teen Hideout" or "Vibe" activities and order unlimited "non-alcoholic" specialty drinks (mocktails), they will be strictly prohibited from purchasing a "Konk Kooler" or any other alcoholic beverage at the island's bars, which are all linked to the ship's cashless "Key to the World" card system.