I had a dream last night, that all of my hair were turned into grey or white. so I checked the dream dictionary via google, it says:

Dreaming that you have gray or white hair indicates that something important has just been made aware to you. It is a symbol of knowledge, wisdom and insight. The dream may also be a metaphor suggesting that you are feeling "light-headed".

That's totally incorrect. I think it indicates that I am afraid of aging.