Sea Org no longer admits children

At 9:30 in this video the narrator says, "The Church says children are no longer admitted into the Sea Org".

Is this true?
If so, when did they stop admitting children?
Does this include everyone under the age of 18 in all countries?
Are they getting around this by having children file for emancipation or other technicalities?
Can anyone point to a written document supporting this statement?

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Sea Org no longer admits children