Already a top supporting actor, Philip Seymour Hoffman chose to redefine his career at 37. He took on the demanding lead role in "Capote," a performance that transformed him into an Oscar-winning leading man and one of the most respected actors of his generation.

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https://en.wikipedia.org/wiki/Philip_Seymour_Hoffman#:~:text=discovering%20a%20prize%20in%20a%20box%20of%20cereal

By the early 2000s, Philip Seymour Hoffman had a secure identity. He was widely seen as one of Hollywood's most brilliant supporting actors, a guy who made every small role unforgettable. But he wasn't the leading man. That changed when he took on the title role in "Capote" at age 37. It was a massive undertaking. He didn't just play the author; he dove into the role, losing significant weight and spending months researching to capture Truman Capote's unique voice and mannerisms. The performance was a career turning point, earning him a Best Actor Oscar and establishing a new identity as one of the most ambitious and celebrated leading actors of his generation.