Here is a list of life expectancy averages for wild sea mammals. The life expectancy for captive sea mammals is much shorter, up to 1/3 of the expectancy for sea mammals living in the wild.
Orcas: Average
- Female 50 years - maximum 80-90 years
- Male 30 years - maximum 50-60 years
Bottle nose Dolphin: Average
- Female and Male 30-45 years
Manatee: Average
- Female and Male 50-60 years
Sea Otters: Average
- Female and Male 10 years
In captivity the oldest otter was 23 years old.
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