The youngest seafloor rocks are typically found at mid-ocean ridges, particularly in areas such as the East Pacific Rise and the Mid-Atlantic Ridge.
These mid-ocean ridges are underwater mountain ranges formed by tectonic plates diverging. As these plates pull apart, magma from the mantle rises to fill the gap, solidifying to create new oceanic crust. This process is called seafloor spreading.
Since the newly formed rocks are created at the ridges, they are much younger than rocks found further away from the ridges, which have had more time to age. The age of the rocks increases as you move away from these spreading centers, providing a clear illustration of the geology and tectonic activity of our planet.