How many years old were you when you found out an allergy to water exists?

It's extremely rare but it's called Aquagenic urticaria and supposedly people get hives and rashes and skin issues when in contact with water for the most part it's skin allergy but some do report throat inflammation and stuff when drinking it but for the most part it's skin allergy, the skin rash and stuff can last 30 minutes up to about 2 hours before it disappears, pretty wild.
How many years old were you when you found out an allergy to water exists?
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