* He started acting in small roles in the late 1990s, but his breakthrough role was in "High Fidelity" in 2000, when he was 31 years old.
* He gained further recognition in "Shallow Hal" in 2001, at 32 years old.
* His success continued with "School of Rock" in 2003, where he was 34.
So while it's difficult to pinpoint an exact age where he "became" a movie star, his career really took off around his early 30s.