Answer :
Between 5.1 million to 7 million years have passed since the Hawaiian Islands were formed. The Big Island is just roughly 5.1 million years old, while Kauai is the oldest.
The Pacific Plate crossed the Hawaii hotspot during the formation of Kauai, which has volcanic origins. It is the oldest of the major islands, dating back around five million years. The next oldest are the islands of Maui, Molokai, Lanai, and Kahoolawe, which formerly formed a one landmass known as Maui Nui. Greater ages may be found on Oahu and Kauai, with the latter being around five million years old. Similar to the other Hawaiian Islands, Kauai was created by volcanic activity over the course of millions of years. The volcano that formed Kauai is thought to have first erupted some 10 million years ago, while the island itself is thought to be 5 million years old.
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