My goodness, I never realized Jamie Lee Curtis would cause such a flurry of confused activity! To answer your questions:
1. It's Jamie Lee Curtis. I've included another (hopefully more clear!) picture.
2. No, as far as I know, she's not levitating.
3. No, I would not pose nude when I'm 50. However, in my book, the AARP picture is FAR from nude (to the reading public at least). Seems to me a better description would be "strapless". Good grief, the media acts like she posed for a nude centerfold!
Anyway, hope that clears things up a bit.