The problem will be when they are singled out and left out of conversations because they don't have an iPhone. iMessage and facetime are major features that teens use to communicate with their peers.
I have been around and worked with teens before and after smartphones came on the scene and I hardly ever saw one with an Android phone, unless they were guys and then they had Samsung phones. Girls are always going to gravitate to iPhones because they use their phones to communicate with their friends constantly. Guys, I would say, use their phones much differently and often don't care as much about what other people think of them when it comes to what phone they have.
I'm making a broad statement from my perspective and it certainly doesn't apply to everyone. Just speaking from my experiences.
Maybe android has grown in popularity among teens in recent years, but probably not by much.