CF--It's difficult to see how much grey you have, but I think we have about the same amount.
If your grey is still in streaks, I think highlights will do nicely, and you won't have to color all that often. I have my hair highlighted (lighter highlights and sometimes also lowlights) every 12 weeks, and as the hair grows, the streaks of grey sort of blend in with the highlights. At 12 weeks, there is about an inch of new growth, but it doesn't look bad. The new growth is my original dark color plus the fine strands of grey.
Right now I'm on a chunky highlight kick, but I've also had much finer highlights.
If your hair is more uniformly grey, I would think highlights would be more difficult as the new hair would be line of grey as the new hair grows in. I'll post a pic, but you can't see the grey yet as I just had it done. These are very white contrasty highlights this time.
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