Lifespan, longevity, and ageing
Maximum longevity: 90 years (wild) Observations: Reproductive senescence has been reported in this species and no female over the age of 48 has been observed to give birth. Maximum longevity in the wild has been estimated to be around 90 years and the MRDT was calculated to be about 14 for females (Foote 2008). Anecdotal evidence, which could be true, suggests these animals may live up to 100 years. In captivity, one wild born animal was still alive at about 37 years of age (Richard Weigl 2005).