We All Fall Down (2016)

Todd, a haunted young man, struggles to protect the innocence of Benny, his mute kid brother, in a post apocalyptic world where all the adults turned to zombies by a recessive gene. The gene continues to activate in the remaining feral kids as they reach adulthood, causing a short and vicious life span.
Kurt Knight
Ashley Santos, Cardiff Gerhardt, Robert Nunez, Kalli Therinae
12 Aug 2016 (USA)