On TV you look fatter than you are and fat tends to sag on old women so old celebs like Demi go super lean. The older you get the thinner your skin and larger your veins. Plastic surgery does not look good. Add all these up plus a long flight and tour and thats what you get.
Even in her heydays, she was ok-decent, but never looker, like say Kathy Ireland, Janet Jackson, or Mariah Carey.
Those veiny hands will forever haunt my dreams. No wonder Guy Ritchie finally got his head out of his ass and started making good movies again (hoping this is true...please please please RockNRolla).