Perhaps have you hitherto been down with a runny nose? Likely did you recover from the cold? Naturally you survived it! You won't heal a runny nose directly, but your system generally establishes resistance to a particular cold virus within several days. That is called cured by your very own immune response!

Grownups have actually in the past had a lot of the runny nose viruses. Parents have created resistance to the ones they have actually had. Therefore there are not quite as many cold infections remaining for parents to become infected with. That is why grownups just get infected with a couple of colds annually and children may get a dozen colds per year.
https://lookbook.nu/user/9831256-Kris