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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.
1 In late April and May, females of both species give birth to four to five young in an underground nest lined with dried grass and other vegetation.  At around 60 days of age, the mother leads her young out at dusk to forage and hunt. At three months old the skunks are almost full-grown and completely independent.