In New Jersey, the legal age to gamble at casinos and racetracks, including betting on sports, is 21 years old. This age requirement is in line with the legal gambling age in many other U.S. states. It’s important to note that this age restriction is strictly enforced, and individuals under the age of 21 are not permitted to engage in gambling activities at licensed facilities within the state. Always make sure to check the most current laws and regulations as they can change.