Wyatt Shears was 5 in Chicken Run when he played the character 'Additional Chicken (voice)'.
That was over 24 years ago in 2000.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 30, and has starred in 3 movies in total, 2 of those since Chicken Run was released.
In Chicken Run, I think Wyatt Shears looks: