Hi Meg...you bring up several good points about cause and effect. I'm not a doctor, but I work with a plastic surgeon who performs Columbia, Maryland eyelid surgery and I in my experience stress, worry, and unhappiness plays a huge role in facial aging. Re: your question about where different emotions are likely to reveal themselves on the face, you obviously have to remember that everyone's different. But almost universally, the eyes are going to start showing age before anywhere else. Worry and anger often trigger the same sets of facial muscles in the brow and forehead, creating those horizontal lines along the forehead and vertical lines in between the eyebrows.