In most online casinos you have to be older than 18 years of age to play. But many of the Microgaming casinos don't let you register even if you're 18. Correct me if I'm wrong, but I haven't been able to register with any MG casino with the new Viper software (I'm eighteen). In some cases casino support will gladly open an account manually for you, but this gets exhausting in the long run, especially If you have to wait hours to get a respond.