I don't understand why people with gray hair try to cover it up with coloring
I agree, there is nothing wrong with gray or speckled hair. Perhaps it is because many celebrities do it as well.
Even more odd is the granny hair trend where young women are coloring their hair different shades of gray.
Perhaps if more young women did that then the older women would stop dying their hair! Funny how fads come and go so quickly.
Yes.  They say the trend is attributed to fasion designer Jean-Paul Gaultier's  2011 fashion show
The strangest hair trend to me is the mullet. I have seen quite a few men sporting them recently.
I love "cool hand luke" where they refer to defeated villians as mullet heads.