Sienna Guillory was 17 in Riders when she played the character 'Fenella Maxwell'.
That was over 31 years ago in 1993.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 49, and has starred in 45 movies in total, 44 of those since Riders was released.
In Riders, I think Sienna Guillory looks: