I have a few around the forehead...but since I color my hair, I have no idea how many there really are! LOL
My mom went gray early, but my dad had really dark locks until well into his 50s (I hope I inherited SOME of that gene!)
However, if premature graying doesn't run in your family, I have heard that a copper deficiency could be a cause...maybe examine your diet for mineral content to see if you get enough through your food intake???