First of all, I want to say that I started watching this show when I was twelve and I was not bothered by it in any way. Then again, I'm not easily bothered by anything anyways which is why I think 13 would be a good age to start with. Like many people have said, it really is a know-your-kid/self situation. The show is beautifully made and there are a lot of great points about family. However, the violence is the only and main concern here. There are frequent beheadings, stabbings, and shootings, almost all are on screen. While it can be pretty graphic, unless you or your child are a bit squeamish then it will be okay. Language really isn't that bad, "whore", "bitch", and "damn" is all you're going to find. Sexual themes are sometimes present, but actual sex scenes? Two, maybe three times every couple of seasons. Passionate kissing and bare backs is all that's shown. The show has its flaws like every other show, but that's what makes it realistic for its genre. It's a horror show, you have to remember that. But it is between this and another show that are my favorites. It's a fantastic show about the bond between two brothers. Yes, they sometimes put themselves before the rest of the world, but who doesn't? The thing I love so much about this show is that it is so realistic about human emotion. Most shows have their characters make too perfect choices that aren't what regular people would make. The brothers value life not only amongst human kind but in the monsters they hunt. They only kill when they have to, and even if it's a vampire, they don't kill it unless it's killing people (yes there is a way around it). They care about everyone, regardless of who they are. They sacrifice a normal life and their own lives to save others and have died for humanity before. They might not be a good example in that yes, they do drink and swear a lot, and yes Dean does sexualize women at times, but in the end they are a great example in that they do put the well being of others before themselves most of the time. If everyone in the world would judge someone based off of that persons actions instead of what/who they are, there wouldn't be as much violence. The show has a lot to say about family too. There is a famous quote from a character, "family don't end in blood, boy". The show displays the truth that your family are the people who choose to trust and reply on rather than the people you were born with. It's a great show that will make you laugh hysterically or bawl your eyes out, I highly recommend it to anyone that will be able to stand the violence. Fantastic show.