Jack appears to be either immortal or very long lived. He reveals that he has been around since the at least the Victorian era. He was active as Jack Staff during World War II up until the 1980s when he retired after the Hurricane incident. He looks no different today then he did during World War II. No further background on him has yet to be revealed, although in the twelfth issue of the second Image volume, there were hints of a connection with the "Eternal Warrior".