How old is the currently active shield volcano located in the Kaʻ ū Desert?
Kaʻū Desert:  The desert covers an area of the Kīlauea Volcano along the Southwest rift zone. Kīlauea:  Located along the southern shore of the island, the volcano is between 300,000 and 600,000 years old and emerged above sea level about 100,000 years ago.
between 300,000 and 600,000 years