You have to keep on walking or security personnel will ask you to move on. You can take the kids to a restaurant, kids' attractions and so forth, but they cannot stop in the casino. You have to be 21 years of age to gamble in the Las Vegas casinos or allowed in the casinos' gambling areas.Ĭhildren can only pass through the casinos gambling area with an adult at least 21 or older. Know the legal gambling age in the City of Las Vegas, Nevada.