I think it's hard to say how old she looks without seeing her in real life. I suppose, knowing she has access to seemingly every beauty product on the market, people have higher expectations of how she should look than they would for other mere mortals.
I did see her in real life at the Beauty Bash the other year but yeah, point taken. I suppose it's natural to expect her to look 20 years younger or something but who can say what genetic influence there is etc, maybe if she didn't have access to all the fancy skin stuff she'd look a whole lot worse. There's only so much products can do no matter how good they are, Alison not looking 15 doesn't mean the stuff she uses isn't really good.