I knew that a vaccine for chickenpox had come out, but I didn’t realize how prevalent it had become. According to Should Your Kid Receive A Chickenpox Booster?:
The incidence of chickenpox has fallen 85% in the U.S. since Merck & Co. introduced its vaccine in 1995. About 75% of children are getting the shot, according to the New England Journal of Medicine. While some vaccinated children still contract the disease, they tend to get much less sick and have fewer scars than unvaccinated children. The side effects are minor; about 5% of vaccinated children develop soreness, redness and a rash at the injection site.
Of course, I managed to go decades without catching chickenpox — only to get it in 1994. When did the vaccine come out again? Oh, right, 1995.