mountian lions live about 18 to 20 years in the wild
time 20 years
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The oldest known mountain lion was Scratch who died just two months shy of his 30th birthday. Prior to Scratch, who lived at Big Cat Rescue in Tampa, FL, the oldest known mountain lion had been in the Guinness Book of World Records at the age of 23.
The average lifespan in the wild for a mountain lion is 10 - 13 years but in captivity it is 15 - 20 years.
In the wild, cougars are expected to reach 8-13 years; while in captivity, they may reach as much as 20 years of age.