‘We were all just in awe’: A stranding in Ireland sheds new light on the long, slow, ice-cold life of a deep-sea shark BBCGreenland sharks swim so slowly that most people could walk faster than them, may not reach sexual maturity until around 150—and the oldest known individual was estimated to have lived for roughly four centuries ScienceBlog.comDeath of a 150-year-old shark amazes scientists Zamin.uz