The expected maximum lifespan of hooded seals is 35 years. In this sexually dimorphic species the differences in body size among males and females result in differences in longevity. In hooded seals males are larger and have shorter lifespans. The mortality rate of adults is 7 to 15% a year. One cause of death is known to be infections from the parasitic heartworm, Dipetalonema spirocauda. Before there were restrictions on hunting, humans were the main cause of death in hooded seals. Captive hooded seals have been reported to die from tuberculosis and cranial infections.
Status: wild: 35 (high) years.