My sister had them for the first time this year. She is 10.
Yes.... The can reoccur.
Does past infection make a person immune?
Yes. Most people who have shingles have only one episode with a disease in their lifetime. Those with impaired and/or weak immune systems may suffer repeated attacks.
My neighbor is like 80 something now but he's had shingles since he was 17 and he has a breakout like every 10 years.