K.J. Apa was 18 in A Dog's Purpose when he played the character 'Teen Ethan'.
That was over 7 years ago in 2017.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 26, and has starred in 7 movies in total, 5 of those since A Dog's Purpose was released.
In A Dog's Purpose, I think K.J. Apa looks: