Question

Where are the youngest rocks on earth located

Answer 1

The youngest rocks are easy, they're just freshly formed rocks from magma, either on the ocean floor (basalt) or the surface (lava rocks).

The oldest ones are little harder to find, you're basically looking for aggregates that have been protected well enough to keep from wearing down. There are some of these multi-billion year old rocks in Australia and Canada. And it's not so much that the "got there" but rather that there was something else there to protect them for a long time from weathering, and they would obviously have to be composed of very hard minerals. You're not to going to find very old talc.