Lifespan, longevity, and ageing
Observations: After fertilization, implantation is delayed for 3.5 to 4 months, making the total gestation period to be approximately 11.75 months (Ronald Nowak 2003). In the wild, females have been estimated to live more than 30 years (http://www.demogr.mpg.de/longevityrecords), which is possible but unverified. Their longevity in captivity has not been studied in detail but one wild born specimen was about 25.1 years old when it died in captivity (Richard Weigl 2005).
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