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Typical life spans for domesticated skunks are considerably longer than for wild skunks, often reaching 10 years, though it is not unusual for a well cared skunk to live well past 20 years - this would lead me to believe that skunks in the wild live for 3-7 years, but that's certainly not their life span potential.
The oldest skunk fossils are 10 million years old (the end of the Miocene): Pliogale and Martinogale encountered in Kansas. Today, 3 genera are known, all being over 2 million years old (from Pliocene): stripped skunks (Mephitis), spotted skunks (Spilogale) and hog-nosed skunks (Conepatus).