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Anyone who has been infected with chickenpox -- that's more than 90 percent of adults in the United States -- is at risk for developing shingles. The incidence and severity of shingles, as well as the frequency and severity of its complications, increase with age. About 40 to 50 percent of the estimated 1 million cases of shingles that occur in the United States each year occur in people age 60 and older. Shingles can be unpredictable and can occur without warning at any time.