And of course you will most likely acquire one more cold, because there are more than several hundred different runny nose infections. Yet you will unlikely get the exact same cold virus that you had before because you have created resistance to that particular cold virus.

Adults have currently had a lot of the rhinitis viruses. Parents have established immunity to the colds they have had. So there are not so many runny nose viruses around for parents to catch. That is why grownups only acquire a few runny noses each year and children usually get a dozen colds each year.
https://www.codecademy.com/profiles/entineqdvk