Dove Cameron was 16 in Disney Parks Christmas Day Parade when she played the character 'Self'.
That was over 10 years ago in 2013.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 28, and has starred in 33 movies in total, 28 of those since Disney Parks Christmas Day Parade was released.
In Disney Parks Christmas Day Parade, I think Dove Cameron looks: