"fighting for his life as he hunts his older self"

In a futuristic gangland in the year 2044, a 25-year-old assassin named Joseph Simmons (Gordon-Levitt) works for a mafia company in Kansas City as a "Looper". Loopers kill and dispose of agents sent by their employers from corporate headquarters in Shanghai from the year 2072. Loopers are foot soldiers, paid on the condition that all targets must never escape. When Simmons recognizes his target as a future version of himself (Willis), his older self escapes after incapacitating him. The failure of his job causes his employers to come after him, forcing him to fight for his life as he hunts his older self.

http://upload.wikimedia.org/wikipedia/en/0/0a/Looper_poster.jpg