Well, join the club. My first gray hair was when I was 18 yrs. I started dying it in my early twenties. I just use the box hair colors. For me, the only ones that actually cover my (difficult) gray is Preference or Excellance by L'Oreal. I like to change up colors. Since I had a medium to light brown hair color, I choose a range in color from dark blonde to medium brown depending on my mood. I also use some of the red's as well. Luckily my brown is lighter and the gray doesn't show through as much as people with dark brown. However, as I get older (50ish) I tend to use a lighter color because your skin tone changes and a darker color really drags down your skin appearance.