Ewan McGregor was 33 in Star Wars: Episode III - Revenge of the Sith when he played the character 'Obi-Wan Kenobi'.
That was over 19 years ago in 2005.
Today he is 52, and has starred in 109 movies in total, 64 of those since Star Wars: Episode III - Revenge of the Sith was released.
In Star Wars: Episode III - Revenge of the Sith, I think Ewan McGregor looks: