My mom had black hair and went the boxed route for years, finally she decided to go all in with the gray...I insisted that she went the professional route... they highlighted her hair with 2 shades of grey... I think all in all she had it done 3 times over a period of 18 months or so... Her hair is salt and pepper grey, completely natural and she is 75 years old...she gets compliments all the time about the color of her hair...she laughs when they ask who does the color she says... the good lord above is my colorist...
My hair is a medium blonde, that's my natural color.. I highlight it once or twice a year... I have a blended highlights ( high and low lights) so that you really can't see the growth. I always start looking in the grow out to see if I can spot the grey's, starting in... my stylist said that I don't really have grey's more leaning to white, which she said is easy to keep it up... My grandmother had the most beautiful head of white hair, and my Dad has beautiful white hair... so maybe I'll be lucky and get that really white hair... I'm not ready for that just yet... so I will just keep on with the highlights for a few more years...