The sad thing is so many women hit the wall in their early 20's sometimes, they don't even need to wait til 30 if they are doing drugs when young:
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compare girls in freshman year of college to graduating seniors and you'll notice this same phenomenom (although maybe not as extreme as Lindsay Lohan). All those drugs, alcohol, makeup. birth control, and casual sex they have really takes a toll on their looks.
When I worked as a lodge manager, at a small upscale resort, I could not get over how men would bring along girlfriends (in their late twenties and early thirties) who from the neck down had a very fit and toned/sexy body, but from the neck up actually looked like a sunburnt grandmother! The skin damage from over-exposure to sunlight, combined with probably some drug and alcohol abuse thrown in, was shocking. There was one case, so extreme, that my assistant joked the female guest must have been a case of a mad scientist doing a head transplant of an old woman onto a young woman's body.