By any chance have you hitherto had acute rhinitis? By any chance did you get rid of the problem? Certainly you did! You won't treat a common cold directly, but your immune system usually establishes immunity to any cold infection within a few weeks. We call that being cured by your personal immunity!

Grownups have actually in the past had a lot of the rhinitis infections. Parents have actually established resistance to the viruses they have had. So there are not so numerous of cold viruses remaining for grownups to acquire. That is why grownups only succumb to a few runny noses annually whereas youngsters usually get a dozen runny noses annually.
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