I pretty much agree. But I'm not leaving out the possibility of a 30 year old and 19 year old hitting it off in a relationship that turns into a life long and stable marriage. The 19 year old is out of High School and may be in college or the work force. She meets a single 30 year old at work and they hit it off. Like I said, I would be leary of this relationship if it happened to my 19 year old. If I got to know the guy and saw that he was a mature and responsible person, I might warm up to the idea.
But generally speaking, yes 30 somethings should stay away from teenagers, especially girls in high school! If a 30 year old considers the local high school to be the "pool" of his potential mates, then he has a big problem and girls be warned. But if it's a mentally healthy and responsbile 30 year old who falls for a 19 year old at the office, maybe he's ok and things would work out.