The oldest oceanic crust (rocks) is found the mid-ocean ridge.

Answer 1

Actually, the oldest oceanic crust is found far away from mid-ocean ridges, not at them. The mid-ocean ridges are where new oceanic crust is formed as magma rises from the mantle and solidifies. As tectonic plates move away from the ridge, the crust gets older the farther it is from the ridge.

The oldest oceanic crust is typically found at subduction zones, where the oceanic crust is being pushed back down into the mantle. In general, the oldest oceanic crust is found in regions where it has moved the furthest from the mid-ocean ridges, such as in the North Atlantic Ocean, where rocks can be over 200 million years old.