The legality of 18-year-olds sports betting varies by jurisdiction. In the United States, for example, the legal gambling age can differ from state to state. Generally, the legal age for sports betting in most states that have legalized it is 21. However, there are exceptions where the legal age is 18, such as in New Hampshire and Mississippi.

Internationally, the legal age for sports betting also varies. In many countries in Europe, the legal age for gambling is 18. It’s important to check the specific laws in your jurisdiction or the jurisdiction where the betting service is offered to determine if an 18-year-old can legally participate in sports betting.

Always ensure that you are using a legal and regulated sports betting platform and are aware of the laws and regulations that apply to you.