Yes, a 13 year old can join eSports. Many eSports tournaments and leagues have age restrictions, but there are also plenty of opportunities for young people to participate in eSports. Some popular games for young players include Fortnite, Minecraft, and Roblox. Many schools and community organizations also offer eSports programs for younger players. In order to join an eSports team or tournament, a 13 year old may need to provide proof of age and meet any other eligibility requirements. It is important for young players to also consider factors such as their skill level and the time and commitment required to compete in eSports.