The retired version of 18 is just like 1 except her eyes are light brown instead of dark. Here is a comparison picture:
18 is on the left, 1 is on the right.
I got my 18 from ebay and sent her to the hospital for a new head in December of 2006. She returned with the scrunchy that went with the Meet Outfit that was in use when she was last available.
Her hair is the same as 1 and 15. They have two lengths. One comes out of the fake skin part of the wig at the top. This section comes in a braid. The other section is all the same length and is in the lower layers of the wig. This section is very sparse and looks terrible from the back when she has her hair in separate braids. As far as hair playability, I like the current 18's hair better.
This doll is beautiful. My only complaint is her wig. There are still things that can be done with it, though.
*better picture of her wig will go here when I restyle her hair again*