Natalia Tena was 16 in About a Boy when she played the character 'Ellie'.
That was over 22 years ago in 2002.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 39, and has starred in 24 movies in total, 22 of those since About a Boy was released.
In About a Boy, I think Natalia Tena looks: