That was over 6 years ago in 2015.
Today he is 24, and has starred in 18 movies in total, 5 since X+Y was released.
In X+Y, I think Asa Butterfield looks:
X+Y scores 6.6 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.