Heyo there!
Strictness: Because we are not officially a European Server, we cannot actually enforce this rule, but we would really like it to stay in place. Because even though we cannot enforce the rules, we wouldn't like 5 year olds and such running around our game :L
So as for your friend, I would have to say no, but because I cannot enforce it, I cant really punish you if you bring them onto the game :L
Hope I helped!