While anyone who has had chickenpox can develop shingles regardless of age,
Steven Furr, MD, president of the American Academy of Family Physicians, said most cases occur in people 50 or older because 99% of adults born before 1980 had chickenpox, and therefore, they have the virus that causes shingles inside their bodies. Even though not all of them will develop shingles, Furr said the risk of getting it increases with age.