Jacob Tremblay was 5 in The Smurfs 2 when he played the character 'Blue Winslow'.
That was over 11 years ago in 2013.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 17, and has starred in 33 movies in total, 24 of those since The Smurfs 2 was released.
In The Smurfs 2, I think Jacob Tremblay looks: