It has nothing to do with that and everything to do with legal and illegal immigration.
Most teenagers today do not have tattoos or piercings or use drugs. That’s minority that has been around for decades now. Just as many teens fell into that category in 2000, when the teen employment rate was almost twice as high.
According to available data, way fewer teens use drugs today than in the late 70’s era when Obama was was pothead. They didn’t have trouble getting jobs then if they wanted one.
this study here says that nearly 40% of young people now have tattoo’s
And this recent study shows that nearly 60% of young adults have tried pot
http://washington.cbslocal.com/2013/06/03/pew-almost-half-of-all-american-adults-have-smoked-pot/