Maybe have you a while ago endured acute rhinitis? Peradventure did you do away with the issue? Obviously you recovered! You can't cure a cold directly, but your immune system typically creates immunity to any type of cold virus within a couple of weeks. That is called being healed by your own immune response!

Grownups have previously had a lot of the rhinitis viruses. Grownups have actually acquired resistance to the ones they have had. So there are not as many cold viruses remaining for adults to become infected with. That is why grownups just get infected with a few colds each year and youngsters get a dozen runny noses per year.
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