Jack Whitehall was 13 in Bertie and Elizabeth when he played the character 'Little Boy (uncredited)'.
That was over 22 years ago in 2002.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 35, and has starred in 24 movies in total, 21 of those since Bertie and Elizabeth was released.
In Bertie and Elizabeth, I think Jack Whitehall looks: