You gulp two cups after each other, and wait for the changes...after a few moments, you already feel your adult clothing becoming a bit looser around your body, your muscle mass mostly disappearing and a quick rub across your chin reveals that you don't have beard stubs anymore either. In fact, your body hair is overall a lot thinner. A gaze at your reflection in the magical water reveals that you can't be more than 15, 16 at most. You quickly gather pants and a shirt in your new size, and ponder...is this the age you desire, or will you take another sip?