lawyers don't understand "meme".
Think of it this way, if a random lawyer, or a random lawyer's mom logged on and saw a post, would they be able to figure out that the post was a joke or not?
If not, further communication is required w/the user in question. If so, then it's not an issue.
A lone post that just states "I'm 12" means that, and odds are will be treated as such without any further context than that.
Then there are other factors like "I have the mind of a 12 year old" isn't the same as flat out stating "I'm 12", for example.
Age and contact information are basically the hotbutton issues in terms of moderation. Those are the "no sense of humor" issues I guess you could call them.