My opinion is that its best to start at an older age, because you appreciate it more.7 years ago, i was 16. On one side it's a show for older people, but on the other side, who am I to talk, I started watching X-Files when I was 14, BUT on the third side, I am oly starting to really appreciate X-Files and understand it now, that I'm older, so maybe if you start at a young age you grow into it later on.
What is most important (I repeat, in my opinion) is that shows like this should be taken in an adult attitude. Even if you are young.