Maybe have you once been down with a common cold virus? Maybe did you recover from the issue? Obviously you survived it! You can't cure a runny nose itself, but your immune system usually develops resistance to any type of cold virus within a couple of days. That is called treated by your own immune response!

Parents have actually previously had a lot of the runny nose viruses. Grownups have established resistance to the ones they have actually had. Therefore there are not as many runny nose viruses around for grownups to become infected with. That is why parents just acquire a couple of colds per year and kids usually get a dozen colds annually.
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