That was over 11 years ago in 2010.
Today he is 23, and has starred in 8 movies in total, 5 since The Karate Kid was released.
In The Karate Kid, I think Jaden Smith looks:
The Karate Kid scores 6.2 out of 10 on The Movie Database.
Jaden Smith's first acting role was as 'Christopher' in The Pursuit of Happyness, released in 2006 when he was 8.