“They Shall Not Grow Old” is a documentary that uses film from World War I to tell the soldiers’ stories. Instead of showing the movies in black and white and at the normal speed from movies of the time, it is colorized and sped up so that it looks like a modern film. The narration is mostly recordings of interviews of the soldiers. The film is a fascinating time capsule, showing scenes of combat and carnage the way we have grown used to viewing them in modern wars. Seeing the dead bodies, blood, explosions and vermin in color is disturbing and interesting. It is an interesting slice of history, but not for everyone. Lots of blood.