I started getting gray hair the minute I got pregnant at 27. And I never colored my hair because I would never be able to keep up with the roots (my hair grows very fast) and to me roots look way worse than gray hair. My grandmother told me I should die it because she never knew her mother without gray hair. Told her my daughters would just have to deal with it. In 2004 I had chemo and lost all my hair, it came back even grayer, way softer, so I can definitely tell you, gray hair is better than no hair.
Even then i didn't use a wig, still prefer the real stuff.