Give examples which demonstrate jem's continuing maturity?

Examples which demonstrate Jem's continuing maturity is his body hair, height, and understanding of folks. Jem starts growing hair under his arms, under his shirt, and his brows are getting heavier (as in his brows are becoming thicker with hair). Jem is becoming slimmer as he grows taller. Also, Jem explains to Scout that he used to believe there was also only one type of folk when he was Scout's age, but now that he's older, he's realized that there are four types of folks in reality, in Maycomb County -- ordinary kinds like them, Jem and Scout, and the neighbors, there's the kind like the Cunninghams out in the woods, the kind like the Ewells down at the dump, and the Negroes.