There is no definitive answer to this question since it depends on the individual. Some 13 year olds may be ready for the mature content in Euphoria while others may not be. It's important to remember that everyone develops at different rates and what is appropriate for one person may not be appropriate for another. If you're unsure whether or not your child is ready for Euphoria, it's best to err on the side of caution and wait until they are a bit older.