Kelly Macdonald was 19 in Trainspotting when she played the character 'Diane Coulston'.
That was over 28 years ago in 1996.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 48, and has starred in 48 movies in total, 47 of those since Trainspotting was released.
In Trainspotting, I think Kelly Macdonald looks: