In 1970, 121 year-old Jack Crabb, the oldest living man in the world, is residing in a hospice, and recounts his plentiful life story to a curious historian. Among other things, Crabb claims to have been a captive of the Cheyenne, a gunslinger, an associate of Wild Bill Hickok, a scout for General George Armstrong Custer, and the sole white survivor of the Battle of the Little Bighorn.