I think with seasonal allergies there’s too much variation in the different types of pollen that from year to year and even town to town it can differ.
Other allergies work like that though. When I was born I was allergic to hundreds of things. Things like flour and strawberries. I don’t remember being allergic to most of them, however, because I outgrew them so fast. Two big ones that have stuck with me are milk and eggs, however ever since late high school I can eat them when baked into things as it denatures the protein and changes the protein. My allergist has seen patients follow this track and eventually become able to eat the substance raw. So it is possible.
Fun fact: with peanuts there are multiple parts of it once can be allergic too and there are some that people can outgrow and some that they can’t. Guess which one I have lol.
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