Jodi Lyn O'Keefe was 18 in Halloween H20: 20 Years Later when she played the character 'Sarah Wainthrope'.
That was over 26 years ago in 1998.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 45, and has starred in 19 movies in total, 18 of those since Halloween H20: 20 Years Later was released.
In Halloween H20: 20 Years Later, I think Jodi Lyn O'Keefe looks: