How Old Is the Ocean?

The ocean formed billions of years ago.

At this time, about 3.8 billion years ago, the water condensed into rain which filled the basins that we now know as our world ocean.

How old is the water at the bottom of the ocean?

Which of these scenarios is responsible for the majority of water in the oceans is still unclear, but we know that most of the water in the oceans (and on the rest of the planet) is very ancient - on the order of 4 billion years old.

What's the oldest ocean?

Covering approximately 63 million square miles and containing more than half of the free water on Earth, the Pacific is by far the largest of the world's ocean basins. All of the world's continents could fit into the Pacific basin. The Pacific is the oldest of the existing ocean basins.