Great question — answering as the UphillTech team:
Short answer - We don't know canonically, as there is absolutely no information on the matter. All that follows is interpretation of their exchange when they meet. Based on the few short panels of their interaction, we see the Gorosei mention: "We are in the middle of the Reverie. A man with a position like yours isn't suitable to get involved in the world of politics. We only made time to talk because it was you." At first thought, it will seem absurd that the position would refer to him being a Yonko, since the Marines are against them. Many theories have indeed surfaced that Shanks may have some other status that allies him with the Gorosei or makes him worthy to be treated in such a...
Full answer by TheGamer007: https://anime.stackexchange.com/a/49652 (CC BY-SA 4.0).
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