I am 48 and have only 2 or 3 grey hairs here and there. My hair is naturally a kind of ugly brown, so I've had it highlighted for years on top (with my one red streak) and the underneath is natural just because I think I look better with it lighter around my face. I have no problem with going grey. I think I am going to look at it as my natural highlights
I told my hairdresser that if it would ever start really going grey, we could just start blending it in. My DH is 5 years younger than I am and is almost totally grey. He has that great salt and pepper look going on, with a pinch more salt these days ha.