Likely have you formerly had acute rhinitis? Maybe did you heal from the infection? Naturally you survived it! You won't heal a common cold itself, however your body typically establishes immunity to a particular cold infection within a couple of days. That is called healed by your personal immunity!
Adults have currently had a lot of the runny nose viruses. Adults have actually acquired resistance to the ones they have actually suffered from. So there are not so many runny nose viruses existing for grownups to catch. That is why grownups only get a couple of colds per year whereas children usually get a dozen runny noses each year.