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The characters in West Side Story 2021 have ages that fall within a typical young adult range. Riff could be around 20, and Anita might be 19 or 20. But specific ages aren't always explicitly stated and can be subject to viewer interpretation.
In most versions of West Side Story, Bernardo is thought to be around 18 or 19 years old. His age is often not specified precisely but is inferred based on his character's actions and circumstances.