My kid started watching Numb3rs at age 16, since then it has become a staple in our home. I encourage my kid to watch this show because it has really allowed her to look at math in a different way. While she understands that the show often works backwards from an answer, she has found that the theoretical physics explained in the show using simple terms really interest her, and I find her exploring this later. I wouldn't recommend the show for young children who are sensitive to violence as there are a few scenes that may be too graphic, but these do not play too large a role in the overall plot, and only last very breifly.