Truth: It doesn't matter.

While George says it's a common belief that allergies are developed during childhood, that's not the case for all of them. "While the cause or causes of adult allergies still remains somewhat of a mystery, some experts believe genetics, exposure and environmental changes all act as factors," he notes. There's a slight silver lining, though: just as you may develop allergies as an adult, some people also outgrow allergies they once had as a kid.

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