Is 13 too young for a Tool concert?

My son went with his dad, (my ex husband) to a Tool concert. Personally, I am happy that his dad wants to spend time with him and is willing to involve him in things they both will enjoy. I just wander if maybe that has overshadowed the fact where they are going. I go to Ozzfest and other concerts, but have never gone to see Tool. Know their music, but other than that not sure what their concerts include. Have seen Marilyn Manson, and would not take him to see him, but would take him to see Korn or Limp Bizkit.... So, do you think I am right in how I feel about this situation?