In Las Vegas, the legal gambling age is 21 years old. This guide will provide you with all the information you need to know about the minimum age requirements for gambling in Sin City. However, before you plan your trip and start dreaming of hitting the jackpot, it’s important to understand the legal gambling age in Las Vegas. Las Vegas is known as the gambling capital of the world, attracting millions of visitors each year who come to try their luck at the city’s numerous casinos.