The youngest seafloor is located at mid-ocean ridges, which are divergent plate boundaries.

Here's why:

* Divergent Plate Boundaries: At mid-ocean ridges, tectonic plates move apart. This creates space where magma from the Earth's mantle rises and cools, forming new oceanic crust.

* Seafloor Spreading: As the plates continue to diverge, new crust is constantly being created, pushing older crust away from the ridge. This process is known as seafloor spreading.

* Age Gradient: This means that the seafloor gets progressively older as you move away from the mid-ocean ridge, with the youngest crust being found right at the ridge itself.

Let me know if you have any other questions!