@Brian If the Immune System eventually "wears out", then I am damned glad that no one seems to have Polio anymore ! I also had Chicken Pox, Mumps, and Measles the "old fashioned" way. With the exception of Shingles as a "gift" from Chicken Pox, Mumps, and Measles do not "come back" either ! This I have proven by taking care of children who also had Mumps and Measles in *spite of having also been injected with today's "foolproof" vaccines for BOTH !

As to "if you live long enough", that condition also applies to ALL males dying of prostate cancer. In my Seventies, I don't have a trace of it, but IF I LIVE LONG ENOUGH ...... what does *that mean ? When Methuselah becomes *MY little brother ? Sheeee-*IT ! ;-D ;-D