Possibly have you heretofore endured a runny nose? Perchance did you do away with the infection? Obviously you recovered! You can't heal a common cold itself, yet your system generally creates resistance to a particular cold virus within several weeks. That is called cured by your personal immune system!

Parents have actually currently had a lot of the cold viruses. Parents have created immunity to the viruses they have had. So there are not quite as many runny nose infections around for parents to become infected with. That is why adults just get infected with a few runny noses per year whereas children acquire 10-12 runny noses each year.
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