They will give out that number pretty fast. These are questions that will invariably stump a teen. Asking for one's political affiliation is a clincher I've recommended many times. Declining to state political party is one thing - not knowing what a political party is is quite another. Try to elicit adult answers to adult questions and failing that - walk away.
Minors are only able to convince to a point.
Without adult experiences they have nothing to draw on and will ultimately give themselves away. This is, without a doubt - the area of most danger for adult men. They want to get a feel for the place, see if they're comfortable there, see if they're welcome there and determine if it is a place they might like to stay. The minor, on the other hand, is a hit and run type of chatter. They want satisfaction when they want it, the need for immediate gratification will send them to another site if they fail to get a reply to their query.