Black Swan writer adapting Marc Webb's "Lord of the Flies meets Children of Men" movie

It's the movie pairing of our dreams: The screenwriter of Black Swan is writing Marc Webb's post-apocalyptic film, Age of Rage. The film takes place in the future, when all the adults are dead.

According to THR Black Swan writer Mark Heyman has signed a deal with Fox Searchlight to put the director Webb's idea to paper. The project is being kept relatively hush hush, but we do have this little nugget from the trades to go on:

[Age of Rage] is set in a post-apocalyptic society where all the adults have died and a group of teens sets about trying to establish a new society.

How did all the adults die, no idea? But ever since we picked up O.T. Nelson's The Girl Who Owned a City, we've been waiting for a movie just like this to come along.