Nothing wrong with grey hair. The first few hurt the most, after that, it's all downhill. You won't even notice the rapid spreading until it's almost completely covered your entire head.
My hair started greying about 5 years ago, when I turned 30. And it's spread to my beard as well now. I gave up worrying about a long time ago. I'm not going to waste time and money trying to re-color it constantly. **** it. It's a fact of life. As long as the hair stays on my head, it can turn any color it wants.