A lot of the Euro babes aren't tan at all. Look at Julie Silver and Jane Darling.
Most stars are also young, so they don't have the years of abusing their skin. You would really see damage in the late twenties. Depends on how sensitive their skin is and how much tanning bed time they've put in.
Some of the drug use has a way of aging the skin too. On top of this, white people's skin doesn't seem to age as well on average.


