I have a grey hair!!! 
Now, I regularly dye my hair due to an unfortunate red hair vs bleach incident a few years back but I haven't needed to as much lately. And it definitely wasn't there on Monday when I last blow-dried it. But there it was this morning, bold as you like, laughing at me!!!
Nice n easy...here I come
I began noticing the odd grey hair about 15 years ago , but have not noticed many new ones since I stopped using hairspray ( occasionally ) and a hairdryer ( regularly ) !
~ Martin .