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We are going to see a lot of older adults die of chickenpox because they were vaccinated as children, and the vaccine wore off. Mark my words, it will be a real problem 30 years from now.

Vaccines don't last forever. Do you know anyone who got shingles? That's chicken pox, or understood to be chicken pox. If you had it as a kid, you have the virus and when the virus gets powerful enough, you'll get the shingles.

I don't follow your reasoning. If a vaccine is not perfect, doesn't last forever for everyone, we should stop getting vaccines?

“We are going to see a lot of older adults die of chickenpox because they were vaccinated as children, and the vaccine wore off. Mark my words, it will be a real problem 30 years from now.”

Fron WebMD:

“It is also possible for a person who has been vaccinated for chickenpox to develop chickenpox at some later point in life. When that happens, the disease is almost always milder and the recovery more rapid than for people who have not had the shots.”

I grew up during the pre-chicken-pox vaccine era, so I contracted chicken-pox as a child. I then had shingles as an adult. It was uncomfortable, but not life-threatening. I suspect that, 30 years from now, the same fraction of adults will contract shingles from the vaccine as is the case now among the non-vaccinated.