My mom used to say that, about hair coloring. She never did. I have, not because of greys, but to change the entire color. Have done that several times, over the past several years. Haven't done anything, since last summer.
My greys are still a streaky silver, and more around higher than my temples and not that noticeable, half the time. I think I was around 33/34? I can't remember, precisely, it wasn't earth shattering or anything.
Women, in my family get more patchy silverish greys and even at 81, my grandmother, still shows her natural hair color and grey.

I had one great grandmother, that went white, at 30.
And my paternal grandmother turned all white.

Maybe, I'll have more grey than natural color in my 60's. Who knows.