Liam Neeson just can't stop kicking ass in old age. In his newest crime thriller, A Walk Among the Tombstones, which is adapted from writer Lawrence Block's novel, the 62-year-old Irishman plays retired, recovering alcoholic cop Matthew Scudder. An investigation into the kidnapping and brutal murder of a drug dealer's (Dan Stevens) wife thrusts him into the world of sick serial killers and gangsters. Complex caught up with both Neeson and Stevens to discuss the fine art of intimidation, what it was like filming in Brooklyn, and when an aging action star knows it's time to hang up his ass-kicking boots.