Amelia spent the day finding out who decides how old people have to be to watch films.
In her report, Amelia explains how films are rated by the British Board of Film Classification and even got to have a go herself.
"I won a competition to go to the offices where film experts decide how old people have to be to watch films.
It's called the British Board of Film Classification and the black form you see on screen before a film starts is supplied by them.
No-one else has seen the film
First I used the children's version of their website to rate trailers and decide who I thought should be allowed to see them.
I compared what I thought about them to the experts and got most of them right.
I got a black card with my name on it
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The film was really good, but because it's not out until later in the month I can't say what it is.
But it was really exciting to see a film hardly anyone else has seen and my friends at school will be really jealous when I tell them about it.
After watching the film I decided I would rate it a PG.
There were some frightening bits which meant it couldn't be a U, but they didn't last very long.
They were also some funny scenes after the scary bits which meant it wasn't frightening enough to be a 12a.
We had to watch all the credits
And the experts agreed with me too!
We had to stay in the BBFC cinema right until the end of the credits, just in case there was something in them that would change the rating.
The two examiners watching as well said the credits were some of the longest they had ever seen, but they were drawings and cut out paper models floating across the screen to keep us interested.
The examiners even had to check the spellings of the director and producers' names.
And I got to eat some popcorn too, which isn't normally allowed in their special cinema.
At the end of the day they gave me a special classification black card with my name on it. I was a PG!"
Amelia, 10, London
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