Amy Dunne, the character from Gillian Flynn’s novel Gone Girl, is 30 years old at the time the story takes place.
In the book, Amy’s age is explicitly mentioned several times, which emphasizes her youth and the societal pressures she faces. Her age adds a significant layer to her character, affecting her motivations and the dynamics of her relationship with her husband, Nick. This detail is important for understanding the context of her actions throughout the story.