Thread:SpiritedDreaming/@comment-24857712-20150927024310/@comment-26397825-20150927073743

Stress would give him grey hairs early, as it is a knwn fact in our world. They usually start at the temple and spread through the rest of the hair. Plus, if you mention in the notes that he is one of those unlucky people who hapen to go grey earlier than normal, it gives you a completely legitimate reason for him having multicoloured hair without dying it.

And he does seem to have had a stressful life after the raid on his village.