Found: YA Dystopian Fiction

This boy goes to the arcade a lot and plays a game where you sit inside a fighter plane. Might take place in England. There is a big wall around the city. People that artificially stay alive through medicine are very old and control everything. There is an upper and lower part to the city and the people on the lower part eat mold.

The Roar by Emma Clayton.

Yes that’s it. Thanks!