That was over 15 years ago in 2005.
Today he is 75, and has starred in 81 movies in total, 22 since Cheaper by the Dozen 2 was released.
In Cheaper by the Dozen 2, I think Steve Martin looks:
Cheaper by the Dozen 2 scores 5.7 out of 10 on The Movie Database.
Steve Martin's first acting role was as 'Lucky Day' in ¡Three Amigos!, released in 1986 when he was 41.
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