I never colored my hair. I decided early-on that I didn't want to spend the money on hair color, so I've been going gray for years now. People have commented that my "salt and pepper" hair is beautiful. It's more gray than brown now, but I'm not going back!
BTW, if your husband complains, just tell him you'd rather live longer and avoid all the chemicals in the hair dye! If it's good enough for him, it should darn well be good enough for you!! :D