Ages of rocks from different Islands in the Hawaiian island chain show that the islands are progressively older to the northwest: Oahu, 3.4 to 2.2 Myr (millions of years); Molokai, 1.8 to 1.3 Myr; Maui, 1.3 to 0.8 Myr; and the Big Island (Hawaii), less than 0.7 and still growing.