How to repair worn gray grout on my kitchen counter?
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https://www.ronhazelton.com/tips/how_to_replace_tile_grout_in_a_kitchen_countertop
Tile stores now have a grout "paint" that you can apply and it will change the color of the grout. In your case, you might be able to even out the appearance.
I'd clean the area thoroughly with TSP and see if that loosens up some of the dirt that's accumulated over time.