No doubt you will eventually get infected by one more runny nose virus, because there remain more than 300 various cold infections. But you will never get the same cold infection that you had before because you have developed immunity to that particular virus.

Parents have already had a lot of the runny nose viruses. Grownups have actually acquired resistance to the ones they have suffered from. Therefore there are not as many runny nose infections remaining for grownups to catch. That is why adults only get infected with a few runny noses each year and children get 10-12 colds each year.
http://gunnerxeae268.cavandoragh.org/hpv-warts-natural-treatment