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And sure you will eventually get a different cold virus, due to the fact that there are 300 different cold infections. However you will never acquire the very same runny nose infection that you had previously because you have actually developed immunity to that virus.

Grownups have actually already had a great deal of the runny nose infections. Parents have developed immunity to the viruses they have had. So there are not as many cold viruses around for grownups to acquire. That is why parents just get a couple of colds each year and kids get 10-12 colds annually.
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