Perhaps have you a while ago had a common cold? Perhaps did you do away with the problem? Obviously you recovered! You won't cure a cold directly, yet your immune system usually establishes immunity to a specific cold infection within a couple of days. That is called cured by your own immune response!

Parents have already had a great deal of the cold infections. Grownups have actually developed immunity to the viruses they have had. So there are not as many runny nose infections existing for grownups to become infected with. That is why grownups just succumb to a few colds each year whereas kids succumb to 10-12 runny noses each year.
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