You can only get shingles if you have already had chickenpox. The chickenpox virus lives in your nerves, and then reactivates to cause shingles.
The shingles vaccine is not recommended for anyone less than age 60. But I will ask for it anyway, since getting shingles does not protect you from getting it again.
I know. I had a mild case of shingles diagnosed by my drs in 2005 to be exact. Am over 60. I figured it would not protect me from getting them again.