Angourie Rice was 9 in Mercy when she played the character 'Mercy'.
That was over 11 years ago in 2011.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 21, and has starred in 18 movies in total, 17 of those since Mercy was released.
In Mercy, I think Angourie Rice looks: