SCOUT. Scout's maturity is shown in several scenes during the novel. One comes in Chapter 24 after Atticus has joined the Missionary Circle meeting to inform Alexandra that Tom Robinson has been killed. Maudie firmly tells Alexandra to "Stop that shaking" and regain control of her emotions. Scout is impressed.
After all, if Aunty could be a lady at a time like this, so could I.
Perhaps the best example comes in the final chapter when she observes her neighborhood in a diffrerent light from the Radley porch.
I had never seen our neighborhood from this angle... As I made my way home, I felt very old... I thought Jem and I would get grown but there wasn't much else left for us to learn, except possibly algebra.
JEM. Jem's ascent into puberty is documented at the beginning of Chapter 12. He had earlier learned important lessons about life from his experiences with Mrs. Dubose (Chapter 11); and from Mr. Radley, when he lies to Jem about his reasons for cementing up the knothole, eliminating any future contact with Boo (Chapter 7). His heroic defense of his sister against Bob Ewell's attack (Chapter 28) is another example.