Final answer:
In 'To Kill a Mockingbird', Scout initially views Atticus' old age and lack of physical prowess as his chief fault, a view that changes as she grows and understands his moral strengths.
Step-by-step explanation:
In the novel To Kill a Mockingbird, Scout perceives Atticus' chief fault as being old and unathletic, which contrasts with the physical abilities of the other children’s fathers in Maycomb. She initially sees Atticus’ age and disposition as less impressive compared to more traditional representations of masculinity and fatherhood. However, as the story progresses, Scout's perspective evolves, and she begins to appreciate Atticus's moral fortitude and wisdom.