X gender in passport

What age must children be to have an x in their passport?
My son is 10 and i want change his marker from M, Male to X, gender not determined.
are here parents who have experience with this?

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Mamapolo2016 · F

What does your son want?

Danielle50 · 56-60, F

@Mamapolo2016 that isn’t important, what is important in these is freedom for my child! Beeing gender neutral my child can choose what it wants if my child have a masculine period oké Nice wear boys clothes if it have a feminine period nice wear girls clothes it gives so much freedom so as they say here in Germany

Mamapolo2016 · F

@Danielle50 It was important to me to include my child when considering making decisions that will inform her life.

Clearly, you can do what you want.