I think I agree with you Cybil. I think a visible disclaimer (on print or tv ads) is ok. If you live in a world where you think Twiggy (at the age of, what, mid 60s?) doesn't have any wrinkles then you are a sad and hopeless case. Advertising doesn't have to be dumbed down entirely.
But images should say something like "photoshopped" or "airbrushed" as appropriate.
A little while ago The Guardian had an interview with Yoko Ono (70) with a huge close up of her unwrinkled face. I emailed them "Would Yoko's people not let you have the interview without the airbrushed picture, or was that your idea?" Needless to say it wasn't published .