I'm 18, though as I've said before, some days I feel older, some days I feel younger. :p
I don't think age affects a person's ability to waterfight effectively. Well, not much. I'm 18 and I can't effectively handle an XL, but a friend could back when he was 16-17. It depends on size and strength, which will always partially depend on age.
“To achieve a World Government it is necessary to remove from their minds their individualism, their loyalty to family traditions, national patriotism and religious dogma.”…..Brock Adams, Director, United Nations Health Organisation.