Glaucophobia

Glaucophobia 67 (from Latin glauco, "gray") is fear of the color gray. This color phobia is often caused by experiences during the storm, since storm clouds are gray (sometimes darkish blue or green depending on the way light scatters through the cloud), and by simply growing old to have gray hair. So glaucophobics would avoid be in that trigger and other objects that are gray.

Glaucophobia is most commonly suffered by the elderly than any other age groups.