No it isn't....
What's the origin of "coon's age"?
May 25, 2004
Dear Straight Dope:
Where does the expression "coon's age" originate? Is it a racial reference or does it actually pertain to raccoons?
— LDziurda
It actually refers to raccoons. The expression "in a coon's age" dates to the early 1800s, and to the folk belief that raccoons are long-lived. My pal Colibri of the Straight Dope Science Advisory Board says, "References differ, but a wild individual raccoon might live up to 5 to 7 years (average survival being much lower, though, probably 2-3 years), and in captivity they can live up to 14-17 years. So their lifespan is comparable to that of a dog."
In the early 1800s, it's doubtful if anyone knew how long raccoons actually lived, and two to three years in the wild is not really very long. But raccoon fur is hardy and reasonably durable, which might have given rise to the belief of longevity.
Many slang terms use the term "coon" to mean raccoon. Their black eye-mask and nocturnal habits suggest anthropomorphic parallels, so we get the term "coon" meaning to steal or pilfer, for instance. The word also was used in the 1830s to mean a rustic, a country-bumpkin. In 1840, the coon was the figurehead of the Whig Party. (Where are the Whigs now when we need them?)