Why are beast boy and Cyborg still Teen Titans?

I mean the Comic Book not the Cartoon and the thing is that even in Comic Book slow aging it still makes no sense. The Original Wonder Girl and Robin (Donna Troy and Batman (Nightwing in present time)) were teammates of theirs and are now in the JLA and recognizable as adults. How is it those 2 still qualify as Teens? Aren't they adults? Wasn't Cyborg in the JLA at one point?