As you age you normally have to soften your colours - so stick with similar colours but choose the colours that have a more smokey appearance, rather than brights which will overwhelm your appearance.
I'm not a hairdresser, but there are all sorts of colours that could probably be used to liven up your grey hair without changing it to a non-grey colour.
I love short well cut grey hair. I hate long stragley grey hair. It can look stunning on a person.
They grey your hair goes will work with your complexion because your skin also loses pigment (which is why you can no longer wear such dark hair colours as you age), you will need to lighten up, but stick more with Ash shades if your skin is cool.
You can dye your eyebrows too, and keep those long white hairs trimmed.
I started going grey at 15 (though I do dye my hair), and for a long time had black hair, but it's too stark now, and even the really dark shades of brown no longer work, so I'm moving to mid browns now to keep my hair flattering my skin.