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IM, I suggested this once - slightly different reasons though! But I had it quite rightly pointed out to me that any kind of marker would also be a magnet for people who had less than honourable reasons for wanting to know who the minors are. I didn't think of it that way until it was pointed out, but its obvious really.
I think it is down to parents to supervise their kids anywhere on the net.
I would suggest that maybe you shouldn't flirt until you've talked to a person for a while? If they are pretending to be older than they actually are, it should become clear after a bit of conversation.
(hide) If you are waiting for your turn, click on "change" next to the "refresh" on the main page, then set refresh the page to 30 seconds to get your turn to move displayed faster. (Servant) (show all tips)