Why is the Indian Ocean considered geologically young?

The Indian Ocean is considered geologically young because its current basin configuration is a relatively recent development in Earth's history, primarily resulting from the complex, multi-stage breakup of the supercontinent Gondwana.12

While the initial rifting that began the opening of the Indian Ocean occurred approximately 140 million years ago, the vast majority of the ocean basin is less than 80 million years old. Its formation involved several significant tectonic events:13

• Continental Separation: The movement of the Indian subcontinent to the northeast, the separation of Australia from Antarctica, and the westward movement of Africa all contributed to the basin's evolution.1
• Final Configuration: The ocean did not reach its present-day configuration until about 36 million years ago.13
• Tectonic Activity: The basin continues to be shaped by active seafloor spreading along its midoceanic ridge system, which remains seismically active today.45

Because these processes occurred significantly later than the formation of older ocean basins, the Indian Ocean is classified as the youngest of the world's three major oceans.63