Possibly have you formerly had a common cold? By any chance did you heal from the infection? Naturally you survived it! You can't heal a runny nose directly, however your body usually establishes resistance to a particular cold virus within several days. We call that being healed by your very own immune system!

Adults have already had a great deal of the runny nose infections. Adults have created resistance to the viruses they have had. So there are not lots of cold infections existing for grownups to catch. That is why parents only get infected with a couple of runny noses each year whereas kids may get 10-12 colds each year.
https://www.storeboard.com/blogs/general/can-hpv-virus-be-cured/5410476