“The Ancient of Days,” Jehovah God, is depicted symbolically in vision as having hair like clean wool. (Da 7:9) This suggests great age and wisdom, which are associated with gray-headedness. (Compare Job 15:9, 10.)

Similarly, the apostle John saw “someone like a son of man” and observed that “his head and his hair were white as white wool, as snow.” (Re 1:12-14) His hair being described in this manner may indicate that it had become white in the way of righteousness.​—Pr 16:31.