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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.
What to do if a skunk is living under the shed or deck. Your first option is to do nothing at all. Skunks typically live in dens for short periods. Skunk babies are independent by the end of summer, when they leave the den and disperse from their family group. If you can wait until the babies are grown and/or have left, you can then close off the access point to prevent other animals from using the attic as a den in the future.