No specific information about the longevity of Somniosus microcephalus exists. Some scientists speculate that these sharks may live in excess of 100 years. ("Greenland Shark, Elasmobranch Research, and Education Group", 2005)
Mills, P. and K. Wehrly. 2006. "Somniosus microcephalus" (On-line), Animal Diversity Web. Accessed April 19, 2009 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Somniosus_microcephalus.html.