I particularly "love" the infomercial where they make a big deal about how Cindy Crawford hasn't aged a bit in the 10 years since she was 28/29. It always makes me think, "Well, most people don't. Let's see Cindy Crawford 10 or 12 years from now, after using the magical melon extract."
Then again, I once worked with a young woman (27) who "worked on" her tan faithfully, and she had her face leathered up like an 80-year-old. 