Perhaps have you ever before suffered through a cold virus? Perhaps did you eliminate the issue? Certainly you got over it! You won't cure a runny nose directly, but your system normally develops immunity to a specific cold infection within a few days. That is called healed by your own immune system!

Parents have actually in the past had a lot of the runny nose viruses. Parents have developed immunity to the colds they have suffered from. So there are not lots of cold infections around for grownups to become infected with. That is why parents just succumb to a couple of runny noses per year whereas kids acquire a dozen runny noses each year.
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