How old is Holly Madison (Girl's Next Door)'s sister Stephanie?

I just watched"Jamaican Me Crazy"and"Wedding Belles", and now I wonder how old is her little sister. I know that Holly is like 27, but I looked and looked for info on her sister and can't find it. Anyone know for sure how old her sister is?I looked for Cullen too, I couldn't find anything with that name either. Thanks for the info though, that's pretty neat that you went to school with Holly.

I went to high school with her and she was two grades above me so I am guessing she is 27. I didn't know she was on any of the episodes. She is a really nice girl, but it is really weird to me that her sister turned into a bit of a wacky celebrity who is dating Hugh Hefner of all people. Stephanie seemed to be very level headed, but I didn't really know her that well. I ran cross country with both her and Shane, but they never dated in high school so I was surprised to hear that they got together. It also might help if you googled Stephanie Cullen. Madison is just a stage name. Both of their last names used to be Cullen.