Trieste Kelly Dunn was 23 in Mysterious Skin when she played the character 'Date in "Blood Prom" (uncredited)'.
That was over 19 years ago in 2005.
Today she is 43, and has starred in 23 movies in total, 19 of those since Mysterious Skin was released.
In Mysterious Skin, I think Trieste Kelly Dunn looks: