Something I didn't know until just recently: if you've ever had chickenpox, you need to get a shingles vaccine around age 50 - apparently the virus for shingles is very similar to/the exact same type as the one for the pox, which can put you at possible risk for shingles flare-ups later in life. (And I had the pox BAD as a kid. Most miserable 2 weeks of my entire 6th grade life.)