Dean-Charles Chapman was 16 in Before I Go to Sleep when he played the character 'Adam'.
That was over 10 years ago in 2014.
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 11 movies in total, 10 of those since Before I Go to Sleep was released.
In Before I Go to Sleep, I think Dean-Charles Chapman looks: