The narrator of Harper Lee's "To Kill a Mockingbird" is Scout Finch. Scout is also one of the main characters of the book, and, as the narrator, she recalls memories from her childhood.
Scout Finch is 5 years old at the start of the story and 8 years old when the story ends, according to Shmoop.com. The source describes the narrative perspective as being naive. Scout tells stories from her childhood viewpoint, explaining things as she understood them through a child's eyes and not injecting adult commentary. According to SparkNotes, the story does not make it clear how many years pass between the stories Scout tells.