To reserve a hotel room, a guest must be at least 21 years old. In most cases, children are permitted to walk into a casino with an adult and visit any restaurant that is accessible by foot. The reason for this is that casinos are considered adult establishments and are not meant for children. While some casinos do allow children to stay in the hotel, most do not. The answer to this question is a bit complicated. As more and more casinos are popping up across the country, many people are wondering if children are allowed to stay at casino hotels.