I don't think so.
In fact, I really think that teenagers or children can understand Bitcoin much better than older generation.
They are born in digital age, with Internet and they are very open for the new technologies, ideas and projects.
Also, they learn much faster than elderly people and I really don't think they will need much explanation about Bitcoin.
As soon as they see benefits of Bitcoin, they will adapt it.
I don't worry about this point at all.
My thoughts exactly. The best way to explain to teenage children what Bitcoin is is showing them the places on the Internet where they can learn about it. Two weeks later they will be explaining to you what you don't understand about Bitcoin.