what are some good horror film that r appropriate for a 13 tahun old.

Most of the good ones are not appropriate for you.

Here are some good ones in my opinion:(you might have seen some of them)
Scream
Pet Sematary
Candyman
A nightmare on elm street(original)
Demon knight
30 days of night
Fright night(I've seen the new one)
Jeepers creepers
Wrong turn

When I was 13, I watched whatever the hell I felt like it.

When I was 13 I pretty much watched whatever I felt like. Though I wasn't allowed to watch The Exorcist atau Silence of the Lambs but I did anyways. Parents can be finicky when it comes to what their children watch on TV. Unless they just don't care, mine did and they didn't. There really is no age when it comes to movies. Cause kids will watch whatever they want.

The Hole
Zombieland
Shaun of the Dead
The Crow
The original Nightmare on Elm Street
The Woman in Black
Jaws
Piranha (Maybe....)

Most any of the older horror flicks.
Psycho
The Night of the Hunter
The Haunting (original; remake sucks)
House on Haunted bukit, hill (ditto)
Carnival of Souls
The Innocents
The Birds
Village of the Damned
Dracula
Frankenstein
Cat People
Freaks
The Last Man on Earth
Dead of Night
and maybe Peeping Tom, depending on your parents

Those are all musts for any Horror fan, in my opinion, no matter the age. And there's minimal gore, nudity atau language, which makes them good for younger audiences. They're scary without resorting to graphic stuff.

Some of these can get pretty intense for a 13 tahun old so take precaution when watching these film :)

Alvin and the Chipmunks Meet Frankenstein
Alvin and the Chipmunks Meet the serigala Man (this one is kind of intense so be careful)
Beetlejuice
The Little Vampire (again pretty intense but it's a good movie)
Halloweentown
Halloweentown 2: Kalabar's Revenge
Halloweentown High
Return to Halloweentown
Twitches
Twitches Too

Let me know if anda want to know anymore :)

Check these film out...
The Woman In Black 1
It scared the hell out of me. I suggest anda to watch this movie in the light. Please don't watch this movie with the lights off.

The Woman in Black 2
Its the continuation of the first series. Just the time is different and the story too. This is pretty scary sometimes, but anda can watch it with the lights turned off.

Insidious chapter 1
If anda are looking for a "Child-Friendly" horror movie, then anda can watch this whenever anda want. I watched this movie at 11 pm, I, being a chicken, I wasn't scared.

Insidious Chapter 2
It's the continuation of the series. This explains a lot of things that happened in chapter 1. Like the first the first part, this is Child-friendly.

The Conjuring
IT IS BASED ON A REAL STORY. That is what that makes this movie interesting.

- Pet Sematary.
- Poltegiest.
- The Woman In Black.
- The Babadook.
-