You could have had chickenpox before the age of 3 and would not remember it.The thing is, to my knowledge I never had CP so it surprised the heck out of me when I was diagnosed with shingles. The first symptom I noticed was the day DH and I had to do a day trip. Half way into the trip I couldn't sit comfortably in the car seat. I told my husband that it felt like a spring was going bad in the seat. Next day I had the rash and could hardly sit down. Went to the docs after work thinking I had an infected cyst on my bum. His nurse took one look and said, honey, you have the shingles. Next day I called the health department to see if it was safe for me to work and when I told them that to my knowledge I had never had chicken pox. They told me that you can have silent chicken pox where you will have flu like symptoms but no major rash. Maybe one or two bumps that may look like skeeter bites or pimples.
A few years earlier my dad had the mother of all shingles outbreaks. He had blisters on him the size of saucers. The only thing I can think is that I had silent CP from being exposed to his shingles.