Perhaps have you previously been down with a common cold virus? Possibly did you recover from the virus? Of course you got over it! You can't heal a runny nose directly, but your system generally develops resistance to a certain cold virus within a couple of weeks. We call that being healed by your personal immunity!Parents have previously had a great deal of the cold infections. Adults have actually acquired resistance to the colds they have had. Therefore there are not lots of cold infections existing for adults to acquire. That is why parents just succumb to a few colds per year whereas kids get a dozen colds each year.