I'm so glad you revived this thread because I was coming here to post a similar question.
My son is 10 and I am 32 and we have never had chickenpox- at least not obviously. Both my sisters had it (my mom said I had measles) and I slept with them but never got it. My son's sister had it, as well as his cousins and a couple classmates, but he has not had it either, nor is he vaxed with anything. I had titers checked once- not sure what they checked- but they told me I had immunity to nothing.
I'm not sure if, or how much, I should be concerned about this as well.
