That was over 11 years ago in 2010.
Today he is 24, and has starred in 18 movies in total, 10 since Nanny McPhee and the Big Bang was released.
In Nanny McPhee and the Big Bang, I think Asa Butterfield looks:
Nanny McPhee and the Big Bang scores 6 out of 10 on The Movie Database.
Asa Butterfield's first acting role was as 'Andrew' in After Thomas, released in 2006 when he was 9.