The Hair: White or Gray: An Emblem of Wisdom
Source: TTT
Daniel 7:9
As I continued to watch, thrones were set in place, and the Ancient of Days took His seat. His clothing was white as snow, and the hair of His head was like pure wool. His throne was flaming with fire, and its wheels were all ablaze.
Job 12:12
Wisdom is found with the elderly, and understanding comes with long life.