Possibly have you a while ago endured a cold? Maybe did you recover from it? Naturally you did! You cannot cure a common cold directly, nevertheless your system usually establishes resistance to any cold virus within a couple of weeks. We call that being cured by your personal immune system!

Grownups have in the past had a lot of the cold viruses. Adults have actually developed immunity to the viruses they have had. Therefore there are not as many cold infections around for adults to catch. That is why parents just get infected with a couple of colds per year and kids succumb to 10-12 runny noses each year.
https://www.evernote.com/shard/s393/sh/1c819d48-a075-4091-c39b-889f31e19a00/