Possibly have you a while ago suffered through a common cold? Probably did you recover from the infection? Of course you did! You cannot heal a runny nose directly, yet your body usually creates immunity to any cold virus within several days. That is called cured by your very own immunity!

Adults have already had a lot of the runny nose infections. Adults have actually developed immunity to the ones they have actually had. So there are not as many runny nose infections remaining for grownups to catch. That is why parents only get infected with a couple of runny noses per year and youngsters succumb to a dozen colds annually.
https://www.scribd.com/document/485694924/18861Does-HPV-Have-A-Cure