Where would you most likely find the oldest rock and why?

The oldest rocks are typically found in continental crust regions, particularly in shield areas, which are exposed portions of the ancient crystalline basement rocks. These regions, such as the Canadian Shield or parts of Greenland, contain rocks that have remained relatively undisturbed by tectonic processes. The age of these rocks can often reach over 4 billion years, reflecting the planet's early geological history. Additionally, igneous and metamorphic rocks in these areas are less likely to have been recycled or altered compared to younger sedimentary rocks.