What is the age of the isle of Surtsey

According to Wikipedia... "The island of Surtsey began as an undersea volcanic eruption which reached the surface on 14 November 1963. The eruption lasted until 5 June 1967, when the island reached its maximum size of 2.7 km2 (1.0 sq mi)." So it is presently 46 years old (as of 2009).