It is pretty old, it was already popular in the 90ies when Les Inconnus used it. Everyone who wants to appear « in » (in touch with the young) uses it, I’m not even sure it looks that cool to actual teenagers ;)
Teenagers may learn some of these words without realizing it's verlan. For example a strange/weird object can be "chelou", it means bizarre or surprising now, it has lost the semantics of the original "louche", meaning suspicious.