Aidan – Showing his Age?

We started noticing Aidan’s guard hairs beginning to gray around his forehead and at the tip of his tail.  It seems like it happened overnight.  Denali has always been the gray ghost of the enclosure, but if Luna and Boltz keep testing their limits, Aidan may continue with this premature graying.  Of course, we are always concerned with Aidan because he has an autoimmune disorder.  Stress for him has some negative implications.