Is this intended to be a serious question, or a troll? I can't help but wonder.
But, let's assume, for the sake of arguement, that this is a serious question.
Yes, there are plenty of adult TKD practitioners. If there were not, you'd not see them in the Olympics, eh?
From my experience commercial schools in general, regardless of style, target children.
Dirty Dog, I really wish you would stop referring to people as trolls because you don't agree with them. And RTM'ing them for style bashing for the same reason. You are a Senior Moderator. Act like one.