Cady is nine years old in the movie M3GAN.
At this age, Cady's life takes a significant turn after the tragic death of her parents. As a young student, she is confronted with the emotional scars of her past, making her particularly vulnerable. She is subsequently paired with M3GAN, the advanced robotic doll designed to be a companion. Due to her circumstances, Cady begins to rely heavily on M3GAN for all her needs, fostering a deep attachment to the doll. This intense bond and her young age make her M3GAN's primary focus and target throughout the story.