Bella Thorne was 5 in Stuck on You when she played the character 'MV Sideline Fan'.
That was over 20 years ago in 2003.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 25, and has starred in 47 movies in total, 42 of those since Stuck on You was released.
In Stuck on You, I think Bella Thorne looks: