Shiranui was surprised to hear that Nigal was far older than he thought.  "I believe you're telling the truth and understand your hesitancy about me since I walk the path of a shadow warrior, but it doesn't make sense that a human can live that long naturally," he stated to the Lucario elder, "Per the texts I read about the Nobunaga clan, Kazuma would have already exceeded the maximum natural lifespan of humans by the time he attacked your clan.  I have a hunch about how he might have prolonged his life; but what are your thoughts?"