The teenager argument is sooo stupid. Yes, he wanted X as a teenager, now he isn't and wants Y. It's a different but related personality, rights and wrongs just don't ever enter the picture.
Unless he either overcommits as a teenager ("I would never grow up to want Y") or becomes a hypocrite later ("X was never a good idea").
I'm not actually arguing about the whole point. But the argument itself might get your idea discarded even before getting tried on its merits. Think of it as of Bayes of ideas.
Unless he either overcommits as a teenager ("I would never grow up to want Y") or becomes a hypocrite later ("X was never a good idea").