Talulah Riley was 18 in Pride & Prejudice when she played the character 'Mary Bennet'.
That was over 19 years ago in 2005.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 38, and has starred in 22 movies in total, 21 of those since Pride & Prejudice was released.
In Pride & Prejudice, I think Talulah Riley looks: