My experience echoes that of destinationsky.
Rejected by RAF due to telling them I suffered from hayfever, which I did in late teens I suspect, but during the next ten years it diminished and had no impact upon my aviation career during the next 30 years.
I am also told tongue in cheek that there are some 365 types of the common cold so eventually you become resistent to the majority!!
Happy flying - nothing else like it!